Fiancé never initiates intimacy or sex

We’ve been together almost four years, engaged 8 months. We are very happy, very close and very much in love. I am not a crazed sex lunatic but after a few days or at most, a week I start to get pretty horny and will initiate it. But he never does (and rarely did when we were first together). He is healthy, 27 and in great physical shape. We don’t have any kids and live together alone. From what I can tell he doesn’t watch a ton of porn or masturbate every day. So ladies please tell me how TF I can help him want it more? I would just like for him to seem more interested in sex and initiate it with me but he never does. Anyone else have this? What did you do?