system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How do STD's travel from one body to another in the various forms of sex?
gpt
The anus is particularly dangerous because it leads right to where your body actually takes up all of its nutrients from food. That track leading up to your bowels is after the food has been broken down enough that the nutrients can be picked right up and handed off to the blood vessels directly. If any of the hiv virus is being released by a carrier into that track the chances of the other person catching it will be very high. The gay community didn't protect much in the past as it didn't have as much use. Now that people know more about hiv and the dynamics of sexually transmitted disease protection is stressed more then ever.