man the commenters here are bunch of self centered weirdos.

Your gf pays rent sure but so does her roommate so that means shes entitled to sleep without being disturbed in the middle of the night.

you rock up at 10pm (which is rather late) open music and TV and then proceed to have sex probably near midnight thinking Jan is asleep so nothings wrong with it ... umm if shes asleep it doesnt mean you go around making noise thinking it'll be okay. Especially if shes working and getting up early the next morning.

She pays rent, she deserves to be able to sleep without having her roommates bf rock up in the middle of the night and act like he owns the town

Also hearing your roommate have sex in the middle of the night can be pretty uncomfortable.

You might not think you guys were too loud but chances are you were.

I had a roommate who thought she was very quite but it felt like the walls were shaking with their movement and you could hear them 3 rooms down the hall. Most people dont want to hear it regardless of how natural some think sex is.

thats why its a private affair - not done in public.