housemates whose partners always visits and overextend their welcome

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hi, how will you talk to your housemate when his partner is always in your place, almost everyday as if he lives there (these are gays) and he is not neat, he leaves his food containers by the sink and does not know how to throw it away properly. when he comes and the door is open, he will not even knock. when i come home, i always knock even though i live there to make my presence known but he doesn't. it is unfair to the two of us (there are three of us in the apartment) that we are like four in the house but only three are actually sharing the rent and bills.he bathes in our apartment, he sleeps there almost everyday, like six out of the seven days in a week. please help. we don't want to hurt the feelings of our friend but we can't take it anymore