Actually, going by the definition, a homosexual is a man who sexually desires another man (or woman to woman).
Would you object to the notion that a man could have sexual interaction with another man without feeling any hint of sexual desire?
With humans, there will be entanglement with the bodily passions; but in that case,it doesn't matter what kind of passions: would the act be worse if it were carried out by a same-sex attracted man, vs one who just gets off on dominance and cruelty?
I wouldn't get the motivation at all. Why even think of it?