My parents never expected me to not be a sexual being. Instead they made a point of educating me and making sure I was safe. I hit puberty early and my mom made sure I had condoms, even though I personally chose to not have vaginal intercourse until much later because I didn't want to risk getting anyone pregnant and even then knew not to trust condoms to always be effective.
In junior high and high school I came across a lot of people with bad ideas of how to be safe sexually (plenty of people in their 30s are still fairly ignorant). My being free of STDs and child free is due at least in part to my parents never shielding me from sexual awareness, even as a little kid, watching foreign films with sex and nudity practically from birth.