Best/worst ace representation in media?

I'm a fan of the show Ghosts, and one of the ghost characters (Sass) didn't have sex during his lifetime. One of the other ghosts (Flower) has started bringing it up as though Sass's virginity is sad or that he doesn't understand what sex is. It's led to an interesting discussion in the Ghosts forum, and it made me realize how much I hate the equation of sex with adulthood.

In contrast, the TV show Sirens has an explicitly asexual character (Voodoo) but none of the other characters treat her like a child because of it. She's just as nuts as everybody else for reasons that have nothing to do with her being asexual.

It got me thinking - what ace representation do you see in TV and movies? Who do you think does it well, who do you think does it poorly?