Hey, so I'm a nineteen-year-old male who has been sexually active for the past three years. I've been with a few girls (I was only in a "real" relationship with one) since I lost my virginity at sixteen. The thing is that I have a sister who's fifteen and I just found out that she and her seventeen-year-old boyfriend have started having sex. I don't want her to be doing anything like that-at least not until she is living on her own. Am I being a hypocrite, considering I was about her age when I started having sex?