New ones or do some of them come back for more and are repeat fucks.
Maybe he could slow down his libido and do chores for you to make up for his rent?
Despite sharing with us, have you talked to others about his behavior?
Just the fact of having so many guys coming to your place daily increases the chances of him catching Covid-19 and giving it to you. You're young but because of your body type you might not be able to handle it as good as most young folks do.