I'm interested to know what prompted you to ask the question Cheery; are you doing some research or something? Does it have some relevance to your relationship, or are you just curious?
Since you asked, sex is very important to me in my relationship. It was quite late in life (20s) that I became sexually active, and both my wife of almost 37 years, and I, have only had one sexual partner each, one another! That's real monogamy, and it feels rather special to me! Unfortunately, our activity has dwindled with time and is currently almost non-existant, and I think her negative attitude to my CDing, since she has known about it, may be the cause. We're working on this (very slowly), and I posted a request for help here only a few days ago. Here's the link.
http://www.crossdressers.com/forums/...ad.php?t=28480
As I stated in the above post, I have filled the vacuum with "DIY", where dressing, especially in sexy clothes, significantly increases the excitement and pleasure for me. I would be in seventh heaven if I could get my wife to accept this from time to time, and I'm prepared to do whatever she wants to do in the bedroom, or elsewhere for that matter. We have a terrific relationship otherwise, and even if she never changes her mind about CDing, I'll still love her till the end of time.
Tony