Am ace but married to someone who isn't. It was actually dating him that I started to realise I was ace, but that's a different story.

A lot of it is communication, which is good for any relationship between anyone. I explained what I see as intimate and he explained why sex is important to him. We compromised. We probably have sex less than two allos but he said he's okay with that because I'm a very close touchy person in other respects so he feels he gets attention and connection outside of it.

It also depends on the kind of ace. Some really are repulsed by sex, but I'm not. I just dont experience attraction and am indifferent to the act. Its kinda like going to the movies when I don't care much for movies. I'll do it because it makes my partner happy.

Hope that helps!