I (22M) and my partner (40M) have been in an open relationship for the past couple of years. Everything is going great, but over the last year, I've noticed he doesn't seem interested in having sex. He loves kisses and cuddles, but he never seems eager for sex.

I've brought this up with him many times, but he always has an excuse like, "I haven't had sex outside in a while; I need to do that first," "You should initiate when you feel like it" (which I already do), or "Everything can't be perfect in a relationship."

I'm fully on board with the idea of an open relationship, and everything else is working well between us. But I crave intimacy with my partner, and he doesn't. Sex seems to be just a physical activity for him. Is there anything I can do?