A method of sex. “Anal” is the method of inserting the penis, or other objects, into the anus for sexual pleasure.
While Vaginal sex can only be performed with a woman or a futanari, Anal sex can be performed between males aswell, for Yaoi. Many 'normal' people find Anal sex disturbing, disgusting, and/or painful, but the rest find Anal sex to be very pleasuring.
If you get taken to prison, you're going to get ANAL RAEPED.
Sorry, I couldn't help myself but to give an Example..