No. You don't. Sex is nothing like kissing with your butt. And you don't exchange spit. Well, humans don't.

[Fish sort of did.]

And it doesn't really matter if they love each other, either. Sex isn't about love. It probably feels better if you love the other person, but honestly, it's not really about love. It's more about having more babies to make sure there are more of the same animals around. To reproduce.

Some babies are born from eggs and some are born from inside a mother. The ones born inside a mother do not hatch like those born from eggs. There is pain, but it does not rip the mother apart, okay.

[Please don't believe Zuko that it's about kissing with your butt, Yin. Please.]