system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: The idea of giving your daughter a “purity ring” or “promise ring” is a sexist, harmful, and dated concept.

As a female growing up and going through Catholic school in elementary and middle school, I was taught that you weren’t supposed to have sex until marriage, and high value is placed on virginity. Promise rings were prevalent, although I was never given one. I recently saw a father I follow on social media posting about giving his teenage daughter a promise ring. The entire concept of a promise/purity ring is that the father figure will give his daughter this ring around the time of puberty, and the girl makes a promise to remain a virgin until marriage. 

Personally, this concept has always horrified me, but I’d like to understand the reasoning behind it. I’ve always thought they were sexist, because I was always taught that high value is placed on a woman’s purity, and not so much a man’s (although I know there are boys who are given purity rings). I also think that they promote abstinence-only sex education, which is dangerous for young adults. I myself am 19 years old, but when I was in middle school I was taught that abstinence is the only form of birth control. I also believe purity rings are a way of a father having control over his daughter, and it just creates the image that she is his property, instead of her own human being.
gpt
The concept of a purity ring is also done with boys. It is not unique to girls as you seem to think it is. And the religious connotations of staying a virgin are equally taught and required of men. So it is not sexist. 

It can be argued to be harmful and dated as it has been proven that abstinence only education simply does not work and teaches shame associated with sex and masturbation, but you cannot claim that it is sexist. 

Edit: Also the ring does not denote being property. It denotes a personal pledge and a reminder of said pledge. It is about personal honor and keeping your promises and having a reminder of said promise that you wear. It is akin to tying a ribbon around a finger when you make a promise to remind you to keep it. Jewelry has been used for this kind of symbology for thousands of years. That is why many religions have prayer beads, why most cultures have some kind of wedding jewelry (bracelets, rings, necklaces), as well as fad jewelry such as the What Would Jesus Do (WWJD) Bracelets and the like that take off from time to time. Having a reminder of a promise that you have made to yourself, god, family, friends, etc is useful in helping you keep that promise.