Take a hint from the dogs.
Last year during my Roman sojourn it was striking how many people have dogs!
Gender is the first and overwhelming (and often dramatic) concern when two dogs approach each other. It makes all the difference. There are no homosexual dogs! Absolute, discriminatory and intolerant heterosexuality! It's normal. You couldn't change it even if you tried.
There are just certain things that are unchangeable, let us call it, "the birds and the bees!" Gender is specific, always, male and female he made them, nothing in between.