A Boy and his Dog (1975)

So the apocalypse has happened, leaving the world a dusty inferno. Those few who survive must fight for the most primal necessities, like food, water and... well, sex.

Common, just because the world has ended doesn't mean we lose our love for tits and ass.

That's right. Armageddon is no match for everyday horniness.

Who better then, to protagonize the tale, than a man who's horny as a dog, and... his dog. To make it even more interesting, the two are able to communicate. Telepathically. Yep.

And then there's this whole thing where they're pulled into a big underground society and... oh, you're just gonna have to see it.

It's funny, clever, entertaining, and ages well. Kind of like the perfect mate.

IMDB