Anal Sex. Some people say it's the greatest pleasure you can get in bed. Yet I don't see the appeal.
For one, there's the Shit Factor. It never escapes my attention that the anus is also for shit. Getting the remnants of shit on your/your gaypartner's cock is unsexy, like shit in general. Except to some people, who really should go to jail.
Also, they say it's a tighter hole, but a really tight vagina would appeal to me more. Especially because you don't need to buy the lube from a sex store for a vagina. You could steal it, but then you would go to prison and... You know. They don't use lube there.
Essentially what I'm saying is going up the ass is a horrible idea.