How many times do y'all have sex a week?

As
I'm 21 years old and I'm currently in basic law enforcement training. With that being said I may see my boyfriend 2 to 3 times a week if I'm lucky and it's not for long. I have not had sex with him for going on 3 weeks and I've just gotten off my period. Well yesterday I gave him a bj and of course he got off. When I ask him can we please have sex he looks at me at me like I want it all the time. I just don't know what to do. Any ideas?