Roommate's mad because I'm having sex while he's in the house!?! Pls help with advise?

I am 27y old girl I have a roommate. I've been living with him for over 4years so far. Recently ( 3 months ago) I started dating a guy and he sleep at my place sometimes and my roommates makes a big problem because we were having sex while he's there and he asked us to not have sex while he's in the house. My roommate is very religious... So I spoke to my boyfriend and we were not doin anything since last Sunday morning. My roommate was home. he was getting ready to go to church and he was goin to take a shower at the same time that I was goin to... and then I let him go first because i wanted to shower with my bf. So he went and while he was in the bathroom I had a quickie and now I dont know how did my roommate found out about it but he's really mad and Idk what to do.... I thinkis ridicilous .. Idk why is bothering him so much.. What shoud I do? Help pls