I have been known to do that. Anyway, the kids were upstairs doing LeapPad stuff, and the wife and I were watching 'Sean of the Dead', oddly, a movie we both enjoy together.
And this hot zombie chick wandered past the camera, with a great rack, and I said "You know, I'd actually put on a rubber to bang that...", and I had to pause the DVR while she rushed into the bathroom to dry heave. And when she came back out with disgust and murder in her eyes, I said "Hey, it's not like I'd put it in her mouth!" Cue another trip to the bathroom, and more dry-heaving.
"Just because you think it doesn't mean you have to say it!" she finally choked out. Boy, was she pissed.
I tried to explain that I would only do it if I was the last living human on earth, but she was having none of it.