One who takes pleasure in anal play, otherwise known as butt sexing. Usually used in a derogatory manner to put one's (typically that of a heterosexual male) sexual orientation into question. In looser terms, it is used as a substitute for insults such as jerk or asshole.
"Hey Tom, you're a butt-sexual."
1) A humanistic term applicable to anyone engaging in anal play whether they be gay, strait, black, white, etc...
2) A person engaged in anal sex
3) A person obsessed with anal sex
1) Q: Was Gandhi a Butt-sexual?
2) Man, that dude is getting all butt-sexual with him/her