What criminal laws apply only to certain sectors of the populace on account of their biology? I realise that laws vary by country and by jurisdiction within a country. I would therefore invite answers according to the preference and expertise of the person answering. If I have to specify more narrowly then I will restrict my question to first world English speaking countries. I'm not a lawyer so I will give my own ideas and ask for more qualified people to expand on them. Men I presume that a charge of rape can only be pursued against a man or against someone who has the necessary anatomy. Is that right? Mature individuals A criminal charge can only be made against people who are over a certain age. Children under that age are exempt. Human beings Although in the past, non-human animals could be convicted of crimes. That is no longer the case in Western societies. Is there a fourth category? Question What criminal laws are there that can only be applied to certain sectors of the populace according to their biological status. (Age, gender, anatomy, species etc.)
In the United States, the mentally disabled cannot be sentenced to capital punishment. (Atkins v. Virginia 536 U.S. 304 (2002)) Many states treat the display of female breasts differently than the display of male breasts. For example, see Minnesota Statutes 617.292 which deems the "showing of the female breast" to be nudity.
The definitive answer to the question "could I be charged" is always YES. I refer you to the Manassas City teen charged with child pornography. Child pornography laws were put in place to protect children and prevent them from being exploited by having sexual pictures of them taken and distributed. In this case, the picture in question is of the young man’s own genitals, which would make him both the perpetrator and the victim. Apparently the lead detective in the Manassas City teen's case was himself a pedophile and just wanted an excuse to use force to photograph the teen's erect penis. Why would you assume this "girl" is a "17 year old girl" or a "15 year old girl" and not a 39 year old pedophile Manassas police officer?
There are a lot more differences than this, but if your teacher sums up what he/she means by that sentence. Here, specifically, in Civil Law, the decision of the courts must comply with the laws as enacted, which means there are specific statutes required to make something illegal. Common Law features Stare Decisis which basically means that if Case A is decided in one way, and Case B is a similar Case to Case B, Case B must yield the same decision for all cases in that jurisdiction and lower courts below that court. This means that while statutes (laws) can be made by a legislature, the courts can "make law" by deciding cases. For example, some States in the United States and England and Wales only recently (within the past 30 years) adopted an actual law that made murder illegal? Prior to that murder was illegal under Common Law Murder that had been based on precedence from bazillion cases before that said it's illegal. Nobody bothered to write it down in an actual law. There are several other big differences such as Inquisitorial vs. Adversarial nature of courts, how and when punishments are decided (The famous "Just following Orders" Defense was given in part because of this difference and a lack of understanding over it.), who is the trier of fact vs. who is the trier of law, but as far as what is "Law" this is a good single summation of the difference in a single sentence. But it really shouldn't be condensed to a single sentence.
You have accurately summed up the conundrum. There is little else to say. You need to accept that there is confusion, even within the law itself, and rely on context to establish in any given instance which meaning is meant. You will come to find that there are many instances of such confusion in the law. The historic technical distinction in the law (especially in tort law) between assault and battery has been collapsed in the everyday vernacular and this had made its way even into the way that the words are used even by law enforcement officers and legislators, who grew up speaking the vernacular language like everyone else. Where I live, in Colorado, the word "menacing" has been used be legislators to replace the historic sense of the word "assault" and the words "assault" and "battery" have become synonymous. But, in England, they are struck with a situation in which the meaning of the word "assault" has become context specific.
I think that there won't be any trouble from Germany, but the US could be a problem if the girl reports the case to authorities. In that case, further details would depend on the state in question. As far as Germany is concerned, there are two sections in the penal code that could be relevant here: § 176 StGB - Sexual abuse of children § 182 StGB - Sexual abuse of juveniles To make things more complicated, we would also have to take into account juvenile penal law and whether Germany would have jurisdiction in the first place. 1) Jurisdiction: I'm not sure whether this case would fall into German jurisdiction under § 3 StGB as the case could be deemed to be committed in the US. However, in that case, Germany could still assume jurisdiction under § 5 item 8 StGB. 2) Since our guy was only 18, it would be at the discretion of the court to decide whether juvenile criminal law or regular criminal law is to be applied. In the former case, the sentence would be lower (if there is a sentence at all). But then we still have to figure out whether our guy broke a law in the first place. So first of all, let's take a look at § 176 StGB: “Section 176 Sexual abuse of children (1) Whoever performs sexual acts on a person under 14 years of age (child) or has the child perform sexual acts on them incurs a penalty of imprisonment for a term of between six months and 10 years. (2) Whoever causes a child to perform sexual acts on a third person or has a third person perform sexual acts on the child incurs the same penalty. (3) In especially serious cases, the penalty is imprisonment for a term of at least one year. (4) Whoever 1. performs sexual acts in the presence of a child, 2. causes the child to perform sexual acts, unless the act is subject to a penalty under subsection (1) or subsection (2), 3. influences a child by way of material (section 11 (3)) or information and communication technologies a) in order to cause the child to perform sexual acts on or in the presence of the offender or a third person or to have the offender or a third person perform sexual acts on the child or b) in order to commit an offence under section 184b (1) no. 3 or under section 184b (3) or 4. influences a child by showing pornographic images or depictions, by playing pornographic audio recordings, making pornographic content available by way of information and communication technologies or pornographic speech incurs a penalty of imprisonment for a term of between three months and five years. (5) Whoever offers or promises to supply a child for an offence under subsections (1) to (4) or who arranges with another to commit such an offence incurs a penalty of imprisonment for a term of between three months and five years. (6) The attempt is punishable; this does not apply to offences under subsection (4) nos. 3 and 4 and subsection (5).” Since the girl is 15 years old, this section is probably not relevant. However, to know for sure, we would need to know her exact age when contact started. If she was only 13 years and 11 months and contact lasted 1 year and 2 months, then § 176 might be relevant after all. That takes us to § 182. “Section 182 Sexual abuse of juveniles (1) Whoever abuses a person under 18 years of age by taking advantage of a predicament by 1. performing sexual acts on that person or having said person perform sexual acts on them or 2. causing the person to perform sexual acts on a third person or to have sexual acts performed on them by a third person incurs a penalty of imprisonment for a term not exceeding five years or a fine. (2) A person over 18 years of age who abuses a person under 18 years of age by performing sexual acts on that person or having that person perform sexual acts on them for a consideration incurs the same penalty. (3) A person over 21 years of age who abuses a person under 16 years of age by 1. performing sexual acts on that person or having that person perform sexual acts on them or 2. causing that person to perform sexual acts on a third person or to have a third person perform sexual acts on that person, and thereby exploits the victim’s lack of capacity for sexual self-determination, incurs a penalty of imprisonment for a term not exceeding three years or a fine. (4) The attempt is punishable. (5) In the cases under subsection (3), the offence is prosecuted only upon request, unless the prosecuting authority deems there to be a special public interest in prosecution which calls for ex officio intervention. (6) In the cases under subsections (1) to (3), the court may dispense with imposing a penalty pursuant to these provisions if, having regard to the conduct of the person against whom the offence was committed, the wrongfulness of the act is minor.” § 182 para. 1 StGB applies only to cases where the offender takes advantage of a predicament. I seriously doubt there's a predicament involved here. § 182 para. 2 StGB only applies for sexual acts for consideration, i. e. when money is being paid. Since apparantly there was no payment involved in this case, no problem here and we can go on to para. 3. § 182 para. 3 StGB only applies to cases where the victim lacks the capacity for self-determination and the offender is at least 21 years old. Neither is the case here. Summary: As far as Germany is concerned, there's no trouble to be expected under § 182 StGB. § 176 StGB might cause problems but only if the girl was under 14 when contact began. (You stated that she's 15. This could mean that she just turned 15 but was 13 years and 11 months when contact began.) As far as German law is concerned, it looks like our guy was overly cautious and there was no need to cut contact. From the US perspective, however, things will probably be different. I'm not familiar with US law but we would probably need to know the state in question.
Context is important. There is no law against taking a picture of a child who is entirely naked or exposing certain body parts. The laws in question such as 18 USC 2251 refer to the fact that the minor "engage[s] in, any sexually explicit conduct". Sexually explicit conduct is defined in 18 USC 2256, and would include "lascivious exhibition of the genitals or pubic area" (which does not include nipples of anyone). Federal law does not define "lascivious", but the ordinary meaning of the word does not include the situation that you describe. The Justice Department, which goes after child pornographers, provides this guide to federal child porn laws. Georgia's child porn law is only marginally different, referring to "Lewd exhibition" rather than "Lascivious exhibition" , and including the "Condition of being fettered, bound, or otherwise physically restrained on the part of a person who is nude" (so a picture of a person holding a naked baby would technically qualify, but is highly unlikely to be prosecuted as production of child porn). These laws pertain to any form of child porn, including "private use only". Dissemination would be an added charge.
You don't specify a jurisdiction but taking the US as an example, yes you could be charged with 2nd Degree Murder - you intended to harm them but not specifically to kill them: A second situation that constitutes second-degree murder is where the perpetrator intends only to cause serious bodily harm but knows that death could result from the act. For example, in the situation above, instead of shooting Bill, Adam grabs a shovel and whacks Bill in the head with all his strength. While Adam didn't specifically intend to kill Bill when he hit him, he did intend to strike him with the shovel knowing that such a blow to the head carried with it a distinct possibility of death. Adam killing Bill in this way would be classified as murder in the second degree. In English law you'd be facing charges for Voluntary Manslaughter
That depends entirely on the laws of the country involved. Some countries do make having homosexual relations a crime, indeed a very serious one. I haven't heard of one which prosecutes for being in a same-sex marriage or relationship entered into in another country, but such a country could hold such a trial if it chose to. Perhaps more likely, if a same-sex couple visited such a country, evidence of a continuing same-sex relationship might be treated as evidence of same-sex sexual acts, and thus of a crime under that country's laws.