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So based on the things Pippa said there are four people living in this house: her, the furry, the old female roommate that hates her and the other female roommate who is friends with her now.
I think it's very unlikely three women would just accept to live with a male roommate like that unless they had a good reason to do it.
Currently the best theory is that he's obviously so pathetic that they felt sorry for him and they basically don't even see him as a man anymore.
Him being guy is the best alternative explanation.