Recently, there have many posts of women into their 20's getting "caught" having sex. So here's my ultimate question... Is there a switch in the brain that gets flipped when our children become adults that makes us believe that they'll stay pure and virginal forever? The reason I ask is because I don't understand the disappointment these parents feel after learning that their adult children are sexually active. I have two young children but I fully expect them to grow up and experience life in the next 15-20 years. Can somebody offer me different points of views? I really am just asking from anthropologic standpoint.