I lost my virginity when I was 18. Or the first time I had sexual intercourse with a woman was 18. I was a senior in high school. She was a class mate and a co worker. We were doing dishes in the back of a pizza parlor. talking about sex. We were friends and I asked her how she thought I would be. She offered to find out.
I had a couple girlfriends in high school but no sex. In college I had my first girlfriend that we regularly had sex.
I had another girlfriend in seminary before I met my wife. All told there were a handful of other women that didn’t amount to much. A couple one nighters, Some petting, groping oral sex