I think it's sexy, definitely not sick. Just as most guys think about having anal sex with a woman, I think they are curious about receiving it. The issue for married guys is getting the strap-on in the bedroom. That kinda means you already thought/talked about it. I'd like to know how many women fantasize about strapping on and fuckin their man more than how many men fantasize about their woman doing it for them. I think most men have had either a finger or dildo anally (maybe while receiving oral), I guess it's the next step.