Why are male's mood are not the same after having sex ?

He is so moody!!: Hi i have little to go on here with what his moods are like and how the sexual encounter goes. But, i assume from the question that his mood is not better or not 'good' after sex? He may be disappointed. He may be feeling guilty for whatever reason. He may feel he did not perform well enough. Lots could be happening. I would hope you had a relationship that was safe enough to ask him about it.