someone who would only have sex with themselves.

When you eat dirt for the first time and leave your family to build a shack in the woods

One who is only sexually attracted to his/herself.

A person so self-involved, he/she lacks sexual interest in either gender.

To love one's self. Self love.

Some one whos Really into his self.

An individual that prefers sexual intercourse with one's self..

No to be confused with masturbation. This individual would be a hermaphrodite or male that was exceptionally endowed for self penetration.

The process would most likely be achieved through bending a not full erection back towards the perineum or abdomen for penetration.