homosexuality is found in almost every species we look at including worms.

if it were a choice in humans it would have to be a choice for all animals including worms.

please explain to me the mechanism of how worms choose to be gay and how their brain can make such a complicated choice. Is it because they were inappropriately wriggled with by another male worm? did they see two male worms engage in sex and become confused?

Tell me how worms choose to be gay.