A randy tom-cat, especially a young one,  will mount indiscriminately
-- even a piece of sheepskin.
It is not an indicator of any tendencies other than the tendency to try
to f**k whatever is available - be it male, female, or inanimate.
No different to humans in that respect (although humans are generally a
little more circumspect).

Nope not really

Sometimes a male cat will mount another male- this is to do with
dominance rather than being gay. When my two neutered queens have a
serious row the winner does the same thing!

Tortie males are apparently slightly different possibly due to the fact
that the genes for the coat (as far as I recall) are usually found on
the female chromosome (Its late I can't remember if its X or Y) so
tortie males have been observed to behave as if they are almost female
including assuming the mating position of a female when presented to an
entire male

Lesley

Slave of the Fabulous Furballs

Perhaps. Homosexuality has been observed with many animal species.

When I was a teenager, I had a bi-sexual hamster. How did I know that? Well,
when put in a cage with demales, it would try to mate with them. When put in
a cage with males, it would "assume the position" and some of the males
would try to mate with it.

Come to think of it, maybe the other males were gay hamsters...???