Just need advice - sorry the background is a bit long

Okay so my bf and I have been together for 3 and a half years now. We’re both in our early 20s and definitely attracted to each other. The problem is, lately we only have sex maybe once or twice a month...

That’s an average. Sometimes we do it more, but honestly I think that count is pretty accurate. I’m concerned because idk what this means for us. We have a great relationship. We don’t argue more than normal, and our arguments are usually over silly stuff anyway. Now, we do have opposite schedules the majority of the week. He is a restaurant manager and typically works from 12-10, with an hour commute each way. I usually work mornings from 8-4. So we don’t see each other on a normal day from 7 am till 11 or 12 at night. When I leave, he’s obviously sleeping, and when he comes home, I’m usually half asleep. BUT, we also requested Wednesdays off every week so we can have at least one day together. So we have that and usually half a day when one of us works and the other is off or whatnot. So why aren’t we having sex every Wednesday?? Idk. Sometimes one of us is feeling it, but the other isn’t. But then I also get confused cause he’ll mention during the day how he really wants me and he’s gonna “smash” later or we’ll go to dinner and he wants to “have me for dessert.” (Super hot and I’m like here for it) But then night comes aaaanddd....nothing happens. He doesn’t even make a move. It’s very confusing. So I guess I just want to know what we need to do to incorporate sex into our lives again. I feel like a healthy relationship requires intimacy and we’re just not hitting that mark.