Consent in Erotic Romance

I know that sometimes it doesn't make it sexy to have that "May I?" "You may!" exchange in any sort of sexy scene, whether it's romance or erotica. But it's important to me to always have those moments, so that we're all reminded that consent is important. 

Granted, the consent negotiation scenes in my books aren't always the best examples of What We Should Do, (because yes, we've gotta put a little fantasy in there somewhere), but the important part to me, is that the anti-hero makes it a point to ask the heroine, and then respects those wishes.