That is a tough situation, but you have to stand your ground. You have a right to make them go somewhere else. It's one thing if he comes over for a bbq or to watch a movie, but if hes sleeping in the same room as you gals, that is definitely NOT appropriate. Tell them to go to his apartment or get a motel room.
When you have roommates, you will learn to set some rules in place before rooming together. I would ask your roommate if you guys could talk about this - be sure that you have a suggestion on what you feel is reasonable and hopefully she will be reasonable as well.
If the boyfriend is not on the lease, you have some leverage in that he's not paying for any expenses. Be prepared for plan B if this talk doesn't go as planned.
If you guys are sharing a bedroom, I myself would definitely NOT be comfortable with anyone staying over at any time unless I was not going to be there. Ick and ugh, all at the same time.
Be prepared - be nice - be reasonable and see if you guys can't come to some agreement.
If you share the place fifty-fifty then you have the right to say this "I don't want your boyfriend to sleep here coz I won't allow my boyfriend to sleep here either, what do you think?" If she still wants to bring him over then ask her money to book you a hotel room coz you deserve your own privacy based on the value that you own in that room.
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