Well I think love requires sentience (intelligence), which is what we have that animal's don't. It is not uncommon for two male animals to attempt to dry hump, but the relationship aspect isn't there. Although on some occasions, two male penguins can look after a youngster as if they were two parents - even sitting on the eggs.
Um, dude, no offence, but there are other animals that have intelligence. And sexuality has nothing to do with love..... A physical attraction is part of sexuality, but there doesn't have to be love to be a physical attraction.
I'm not sure if I want to get married, but I know I don't want to even imagine myself without my current love. She's the greatest person I've ever met. Kids? Try "KID". Maybe. I DO need someone to carry on my legacy, after-all. Well. Not carry-on, for that would insist I die. Help out my legacy.