Guys, what do you do if you hear you roommate having sex with his girlfriend?

Whenever my guy's roommates are home and we have sex, I feel really awkward/uncomfortable that they might be able to hear us lol. I'm much quieter if his roommates are home, but I know they can still hear his bed moving and everything. When I'm leaving and I see them, I get embarrassed (even though they don't say anything about us having sex).

Do you guys just pretend that you don't hear what's going on in your roommates bedroom? I've never had roommates so I don't know lol.
Guys, what do you do if you hear you roommate having sex with his girlfriend?
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