I'm pretty sure most of them engage in it because they're horny, not because they think it's trendy. You want a virgin, but are you a virgin yourself? Virginity is overrated, IMO.
An attractive 25 year old woman 99% of the time will have already met their "perfect partner", had a relationship, maybe married and divorced with no children because it wasn't as perfect as she thought. Like my stepmom, she was a virgin, married her high school sweetheart at 18, came home and walked in on him banging some other chick, divorced him, married my dad a few years later... sure, she waited until marriage, but apparently she was young and naive. These stories are a dime a dozen, rural conservative Christians marrying young, then divorcing in their early 20's. This is what conservative Christian abstinence promotes on a good day. On a bad day it promotes blatant ignorance, unprotected sex, teenage pregnancy, and spread of STD's.