I think my roommates spying?

I’m new to having roommates, I’ve been rooming with this guy for about a month... he’s cool and everything but when I bring my boyfriend over, I don’t know why but I feel my roommate tries to listen to our conversations and sometimes when I have sex, I try staying quiet and a few time I heard the hallway creak...

How do you know if you’re roommates spying on you during sex?