Boyfriend is uncomfortable

Hey guys, so I love my boyfriend to death, but sometimes when it comes to sex.... I get a little bored because it’s a little vanilla. My boyfriend is kind of uncomfortable with bodily functions, like he thinks that cum is gross and does not like seeing it on me or getting it on himself afterwards. Or my period is supper gross to him, like he won’t even play with me over pants. Anyways does anybody else have a guy who’s more conservative-I guess?- then you? Or is uncomfortable with body functions? How do you over come this?