Here is an example of what is passed of as homosexual behavior in lions: “Male lions pair-bond for a number of days and initiate homosexual activity with affectionate nuzzling and caressing, leading to mounting and thrusting.”
Or, “Also, mounting of one female by another (known as “bulling”) is extremely common among cattle. The behaviour is hormone driven and synchronizes with the emergence of estrus (heat), particularly in the presence of a bull.”
They also use dogs mounting each other as evidence of homosexual behavior.
But is it dominance? Is it the equivalent of homosexuality in prisons, where there is lack of females? Is it hormonal driven?
What it generally is not (with very few exceptions) is males penetrating the anus of another male as preferable to sex with females....
https://en.wikipedia.org/wiki/Homosexual_behavior_in_animals
Heck, my pet goats are very indiscriminate as to which gender is at the end of their noses when sniffing time occurs.
They also butt each other without regard to gender.
The girls will ‘bully’ each other more than the guys do!