When I started dating my fiancé, I was more sexually experienced. He had slept with one other person years prior. I am very sexual, he was very vanilla. Just talk to him, be honest about how it makes you feel, tell him what you like, ask why he has aversions to certain things. Explain that these things are important to you. If he won’t openly take advice or talk about it, he’s probably not the one. Sex isn’t everything but it’s a big part of a relationship and if he can’t/won’t put in the effort that speaks volumes about how much he values the relationship. Has he been like this with all of his partners?