Asexuality is currently "in" now, especially for those looking to get their persecution cred on. It is the very latest in persecuted sexualities. 'Cause, see, being homosexual or bisexual is so very passe now... you have to actually dig around and go to really extremist sites to get someone telling you you're mentally damaged or just have childhood trauma, and it's really hard to feel like you're getting your righteous smiting rant on when you had to go all the way to the God Hates Fags website to get someone to call you a freak. But asexuality, hey, if you throw out that you're asexual enough, you can actually get someone to commit a hate crime (IE saying something you consider insensitive) on you that you can defend yourself against and rally support over on a forum you'd probably go to anyway.
Plus, "trendy" asexuals get to combine their sexuality snobbery with intellectual snobbery ("Psh, look at you, ruled by your animal instincts"), relationship snobbery ("Had a fight with the SO, did we? Well -I- don't have -that- problem"), and you'll even occasionally get a bit of green snobbery in there ("Well I'm certainly not going to be screwing up the planet by adding a bunch of squaling crotchdroppings, unlike those SEXED people").
Honestly, this is probably the absolute best choice to make for a claimed sexuality for 2. Asexuality has far more options for pretentious posturing than being gay, straight, or bi ever could!
Of course, it also means he'll be an even less funny comedian. People like jokes about guys and their girlfriends. People even like jokes about guys and their boyfriends. They like jokes about guys that want sex but can't get it, or guys that want it and do humorous things to get it, or guys that get it in improbable ways, and so on... and what's 2 got?
"Hey, let me tell you about all the sex I'm not having! Nor do I want to have it! Ever! ... Hey, who wants to hear me bitch about a nerd convention for ten minutes?!"