It isn't a foursome. My former friend fucks his wife on mondays and wednesdays, his wife fucks her boyfriend on tuesdays and fridays, my friend smokes his wife's boyfriend's pot on the coach alone on tuesdays while being cucked by a genetic female with a fake penis in the other room and on fridays he fucks his boyfriend's genetically female vagina. The wife's boyfriend and he don't fuck in front of each other as I understand It and the boyfriends who are both genetically female are married to each other. There is only one genetic male in this equation by the way. They used to be in a poly group with like 40 some people but basically nobody would fuck with him and half the men refused to wear condoms or take paternity tests.