Not sure if this is funny but:
When I come downstairs with a Lego model I've built, and my dad sniggers a little, I sometimes say "face it, dad, this is the closest thing to children you'll be getting from me!"

Following is our collection of funniest Asexual jokes. There are some asexual lesbian jokes no one knows (to tell your friends) and to make you laugh out loud. Take your time to read those puns and riddles where you ask a question with answers, or where the setup is the punchline. We hope you will find these asexual homosexual puns funny enough to tell and make people laugh.

Ultimately, you can’t know someone’s aversion until you ask, and that can be a personal question. My advice is, when in doubt, don’t make the joke.

Fuckin' nothin'.
Asexual joke, What's an asexual person's favorite thing to do in the bedroom?
Five asexual people are playing cards

How many Asexuals does it take to screw in a light bulb?
    Quite a few actually, one to change it, and the rest to put labels on the ones that didn't fit!
I also quite like this answer:
    It doesn't matter how many you have, they aren't interested in screwing anything!
I don't get the first one. What do they mean by labels?
I also don't get this one: Why do some Asexuals enjoy hanging around super-markets? Because they like being surrounded by labels!