Agreed on the Emily thing. The grinding was my least favorite part of the episode and I pretty much reacted like Luis when I saw it. She doesn't need to do those sorts of things. It's not attractive at all, at least to me, and I hope something like that was just a one-off.
And to answer your question, Ash in the bathroom was the last time the MC had some, unless you count the BJ he got from Sam in E8. Not into Piper at all, nor the chicks at the club (either pair), the MC and Luis are punching very much above their weight.
But Em is a cute little adorable thing who doesn't need to be acting like that. I mean, c'mon, look at that face...