Mate! good thing you didn't do it. I was about to sleep with a really hot girl, much hotter than ex, around 4 weeks post BU, and we were kissing naked in bed and I was pleasuring her if you know what I mean, and I just couldn't get it up! haha! She started "helping me" and still nothing. She got offended and I felt like I was in a crappy comedy. So embarrassing and awkward, but funny as hell.
The reason was, I think, that my thoughts were still in turmoil, and I was thinking so much I just couldn't live in the moment. I was also not drunk, I'm sure that being drunk would have helped my case.
Btw, you are free to point and laugh. It's bittersweet.