marciemi, I'm no expert, just a mom but I'll tell you what I did. My ds has been dating the same girl for about 15 months. I have talked to my son by himself and with him and his girlfriend about their relationship, sex, the consequenses of having sex etc. At first the conversation was one sided but after a few minutes his gf started talking. She let me know that she has no intentions of being a teenage mother, not that any of them do. She told me her mother would throw her out of the house if she got pregnant, I believe her mom would. We have had those types of conversations more than once. The rule at her house and my house is that they can not be in the bedroom with the door closed. My house is very small so I don't think they would try to do anything with the door open. In reality if they want to do anything they shouldn't be doing they will find a way. I'm lucky that they have watched two of their friends become parents and are seeing how hard it is. That made a huge impression on them. All I can say is keep the lines of communication open and try not to be too surprised when they tell you things that are shocking. Staying calm seems to help.