Although that does not fit with the guys who get married to a female have kids and then suddenly "have to be true to themselves" and get a boyfriend. That would make it a choice and we can't have that so we will not bring it up.
I agree that humans can choose to have sex with any number of things but the key word there is choice.
If you a guy and you can choose to have sex with a girl you are not hardwired to be "gay".
If you are not hardwired to be gay it is not genetic.
They make those toys in the shape of flashlights, even. Or something equally obscure. They let their imagination do the rest.
If they can pretend a plastic toy to be a real woman, they can just as easily (actually, more easily) pretend a woman to be a man they fancy.