Not saying get rid of it, but seems to me a big part of me hanging on til I was 20 was a result of fear, not of pregnancy, but just the unknown. I had no idea what a man's bits looked like, and trust me, in my imagination they were scary (for some reason I thought the testicles were a clamp that grabbed you!)
Not sure that level of ignorance was great, but does familiarity breed more pressure on girls?