i heard my roommate having sex yesterday

This reminds me of the last weekend my brother lived here. We were talking one day and the cats ran so we had the following exchange:
Me: You should stop making that noise. It scared them.
Him: Speaking of noise . . . about last night. I am trying to think of how to put this gently. . .
M: Ah. My bed again? (note that you can hear when someone sits on my bed from other floors in the house.)
H: No. It was more the whipping.
M: Ah. She rather liked it.
H: Yeah I'm happy for you dude. I mean all the more power to you. But it woke me up.
M: ahahahahaha
 
I would have barged in loudly, smacked her in the face, and then just stood there in silence staring at the wall.