Who gives a shit? It won't start rotting and stinking overnight, so why oh why would anyone even think of letting something like that interfere with sex? OP, YDI for being the kind of person who would rather mourn a hamster than have sex.

For example...

As in I'm an example of a guy who is driven by sex? No, my point was just that a dead hamster shouldn't be the reason for cancelling anything. I wouldn't hold a fart for something as universally unimportant as a dead rodent... or cat... or dog... just bury the poor mutt when you get around to it. Or in case of hamster, throw it in the trash.

Most people love pets as if they were a part of the family and would never get rid of their deceased animals in any of the ways you described. You don't sound like one of these people and thus aren't really qualified to actually understand wtf is going on. At the same time sex isn't super high on my list so I can't accurately critic OPs bfs heartlessness.

You sound like an asshole man, even though you might not like pets, they can be very loyal and become part of the family quite easily, and it isn't easy to just let them go. Have some compassion even if you can't understand it yourself...