sex life, private or not?

So I needed to vent, because I for one am someone that likes to keep my sex life private. Obviously I tell my friends some details here and there but I don't feel comfortable with my boyfriend telling other girls about our sex life. I understand if he's gonna tell his guy friends, but why would he need to tell his girl friends? I don't know what details he's giving either. But am I the only one that would feel uncomfortable in this situation?