Sure most men would prefer to fuck women and theres a minority of men who prefer to screw each other, but male sexuality at its core imo is fundamentally opportunistic. Meaning a guy will screw anything or anyone regardless of their sex if he's desperate enough to get his rocks off. Case in point: Prison. You really think all these guys going around raping their fellow inmates are just magically turning gay the moment they're behind bars? Nah fam. What they are is DESPERATE. So much so, they're willing to rape the only other beings behind bars with them (which just so happens to be other men)
Also there's a literal festival in Colombia where men prove their manhood by raping donkeys. Don't forget Pony the orangutan.
Rape isn't about being desperately horny. Rape is about hurting others.