Should I just shut up?

My boyfriend is a super horny guy, but incredibly faithful (for all those who automatically thinks he cheated). He masturbates a lot. More than he has sex with me. And sometimes he does it in front of me.. Like.. Hello? I'm sitting right here. I've brought it up time and time again.. He just likes to do it. I want to have sex with my boyfriend, but I don't want to force him to. What should I do?