Should my girlfriend be allowed to have "guy friends" over at her house at night when I'm not there?

My girlfriend has several guy friends that she hangs out with quite often. Just last night she had two men over who are a gay couple. I think it is inappropriate for her to have men over at her house while im not there. Its not that i dont trust her. Its just that i think that its a principle thing. Its just poor morally to have a bunch of guy friends anyway. I for one just think that most guys do not have friends that are girls unless they are attracted to them and waiting to see if the chance ever arises for them. I think it is naive of a women to hang out with a guy and to think he is just a friend, and to think that she is not teasing him or at least letting him think he has a chance with her. Now i realize there are exceptions to this rule and that there are a few times when there is truly just a platonic attraction for each other. But for the most part men do not hang out with women that they are not attracted to and not waiting for the right opportunity to make their move.