Loki gave Thor a very narrow look that showed exactly what he thought about the weird man-boobs comment.
“I never seem to have any problems with women when my shirt is off. I have no idea what you are talking about.” Part of him considered looking down to see what the heck Thor was talking about but even hungover Loki knew that if he so much as glanced as his nipples Thor was going to notice and make reference to it. Instead, he grinned, “and if there are complaints, those disappear the same second my pants do. Funny, that.”
They both knew damn well he had no problems find female companionship when he wanted it. “Now, in your case....” He was still grinning, obviously feeling a bit less like death and a bit more like teasing Thor.