Adjective; a person who is self-sexual is someone sexually attracted to oneself. Can be considered a sexuality, such as heterosexuality or homosexuality. This may entail flirting with oneself in the mirror or being turned on by naked pictures of oneself.
This also stems to plots of hentai or other porn, in which a person may clone oneself or encounter oneself from another dimension, and then engage in sexual intercourse with oneself. This is often considered homosexual or incest sexual, or a form of masturbation.
That girl is so self-sexual, she would have sex with herself if she could!
adj.
Being sexually and romantically attracted to one's self. It goes beyond just looking one's self in the mirror to check if everything is in place. It goes to the level of actually turning one's self on by doing nothing more than looking at their own self!
A person who is selfsexual may be seen actually flirting with themself in mirrors or becoming aroused by watching nakkid videos of just themself.
Dude One: Check out that chick creaming over herself!
Dude Two: Sheit, all the hot chicks here are either lebsian or selfsexual. We ain't getting any play here!
Dude One: No way! Selfsexual chicks are hella easy.