A fantasy many guys have is a MMF threesome, which stands for male, male, female in case you were not aware. Some males do want a lot of interaction with the other guy in their threesome, others want to mainly serve and pleasure the woman and not worry about the other guy.
Many guys I have talked to do love to suck cock or dream and fantasize about sucking cock, so a threesome with another man is right up their alley. They get to please a woman and get to suck cock as well, it gives them all the sexual variety they seek and dream of. If a guy has a tranny, I guess it’s like he has a threesome with just one other person, but the other person can play both parts, male and female.
I’ve always thought ones in a threesome situation, that one would always feel left out, be like the third wheel so to speak. That one would never be as satisfied as the two active ones, but then I have never done it, so I really can’t say. Only ones that have could. I know many guys I talk to want a threesome with two girls, but some certainly want to have another guy there as well. I recall one kinky guy said he was in a threesome with his identical twin brother, but there was no interaction between them, just pleasing the woman. I can’t say I haven’t had such a fantasy myself honestly.