Sexual orientation
The sex of those to whom one is sexually and romantically attracted. This can include attraction to members of one's own sex (homosexual), members of the oppostie sex (heterosexual), members of both sexes (bisexual), all sexes (pansexual), or neither (asexuality). Some people identify their sexual orientation outside of the gender binary of "male" and "female".
To have more information about this topic, read pur article about fantasies and sexual orientation.