Even when I was teenager (yeah LONG time ago) I was in favor of pre-marital sex. Virginity was a nice concept, but the thought of marrying someone I would have to be faithful to for the rest of my life without knowing whether we were sexually compatible was my personal version of a nightmare waiting to come true.
I didn't endorse promiscuity, but there was no way I was going to commit to someone I had not checked out in two very important ways - (1) did the sex work for both of us, and (2) what was it like living with them.
Unfortunately, I broke my own rules the first time I married and it only took two weeks to realize I needed a divorce lawyer. Those 2 rules are now ironclad and I will never break them again.