If there is something I advise all my girlfriends, I advise them on one thing: ask your significant other how far they are willing to go in the relationship. I know its a scary question, but it needs to be asked. If you don’t, you are probably going to think about and keep wondering about it. Its eventually going to drive you crazy.
I guess the right time to ask the person how far they are willing to go should occur during the Developing Stage (look under Crash Course in Love: Stages of a Relationship). In my personal opinion if you establish how far both of you are willing to go, you can manage each other’s expectations. It also clarifies his tastes and preferences and yours. Once you learn enough about one another, you are able to strength your relationship. However in some cases, sex is a dealbreaker. Be aware.