It wasn't really a thing I was told, but a thing they tried to enforce. I grew up and am in Texas so firstly only two genders. They had all the boys for a week straight have field days and do whatever while all the girls had to go into different classes based on abstinence and virginity. We had to watch birthing videos, confessions on the regrets of sex, how bad it was for the female body, how it wasn't scientifically pleasurable and so on. That wasn't the worst though. Here I was, a young teenager who honestly now realizes I need extreme strong emotional bonds to even feel minor attraction awkwardly sitting in a room with me peers. All we were allowed were writing utensils and a notebook as to not be "distracted" . A few teachers came in with these boxes and started going down their individual rows to hand each girl a dried full rose that was fully bloomed. Telling us not to touch them I could tell by the weird glances myself and a few people shared that this was cult-like to say the least with that always being a subject I was interested in. They then proceeded to tell us those were our virginities and if we're even were to have sex to hold it in our hands and crush it. That our husband's should be given the roses on our wedding nights and that they would be ashamed of us if it was damaged at all. Normally I was a good kid who just got all my work done and went about my day, however sex was something I was already shamed for at home even though I wasn't engaging; no shame to those who did. It was a very touchy subject for me and school was my safe place from ridicule and suddenly here I was being made to feel shame once again. I remember me and one other girl leaving in the middle of their speech and throwing them away in the trash. I got my stuff from my locker as did my classmate and called my grandfather to get me while also taking her home after making sure it was okay with her mom. The school tried to get us both in massive trouble but turned out none of the parents knew about what was happening and for the rest of the week, it was Tuesday at that point I believe, most the students didn't go to school. While my mom was very much pro-abstinence it was good to see that things were taken to far. I didn't go to that health teacher's classes after since it was apparently all her idea anyone. A few years ago both her husband and her were let go from the school for questionable activities with students and last I heard they were still under investigation. Now I tell my husband this story and he seems absolutely mortified. He moved to that school a few years after that so he never witnessed any of this. Thankfully I was always weirdly stubborn and didn't take that sort of thing that may involve religion to heart since separation of church and state didn't exist at that school. Also grateful to have someone in my life who is healthy sexually (lack of better words) than to have that sort of education effect him like so many. There were a lot of young pregnancies when I was in high-school and just after which no shame once again but so many of them didn't know how to use condems either. Shame and purity culture is awful.

TLDR : Week long secret Abstinence teachings only for the girls was the only sex-ed I got in school in a small Texas town. Almost got expelled for ditching