You could tell him a little about yourself and your background, see how he responds. I would say how I feel about sex (enjoy it, have had troubles in the past, have had many/few partners, etc.). Communication has to be open for relationships to work; it's a bit like therapy :-) and if you are "concerned" then you need to let him know that so he can respond or avoid, depending on how he feels, and you can then have more information to decide what you want to do. It's all an information exchange, getting to know another person. When you're snuggling might be a great time to discuss how you feel about intimacy, sex, what you really like about being with him, what you'd like from him, etc.