The part you’re missing is that all of those males that mate with males will mate with females as well.
The paper Wikipedia references about rams notes that the only mammals with exclusive homosexual behaviour are sheep and humans. Exclusive homosexual mating is exceptionally rare. There are about 6000 mammal species.
The Wikipedia sentence should read the only other mammal which exhibits exclusively homosexual mating behaviour is sheep.
Also domesticated animals have been under some pretty weird selection pressures so you have to be careful comparing their behaviour to a wild type animal like humans.
The part you’re missing is that all of those males that mate with males will mate with females as well.
The paper Wikipedia references about rams notes that the only mammals with exclusive homosexual behaviour are sheep and humans. Exclusive homosexual mating is exceptionally rare. There are about 6000 mammal species.
The Wikipedia sentence should read the only other mammal which exhibits exclusively homosexual mating behaviour is sheep.
Also domesticated animals have been under some pretty weird selection pressures so you have to be careful comparing their behaviour to a wild type animal like humans.