While this conversation should be discussed with your parents, I totally get it that sometimes parents aren't always available or willing to hold such a conversation, or.... they may want to sugarcoat things, or try to lecture you or throw religion into the mix. Your health teacher could be a good resource to have a matter-of-fact, no B.S. discussion with you about the topic. YES, the topic SHOULD be taught at home. But when it isn't, a health teacher or P.E. coach could be a good person to speak to. I think you'll be glad you did. And good for you, to be brave enough to want some some honest answers. It takes guts to do that.