I have no idea if there is a difference in orientation abilities but if it exists, it would clearly be biological. I am happy it is a urban legend.
But nowadays too many people claim that male and female are identical with the exception of the penis. And it is pretty dangerous. Any trans person who transitioned can say how different their bodies and feelings are by just changing the amount of few hormones.
The fact that my comment has as many downvotes as upvotes demonstrated that the fact that biological differences exists are not so well known