Monosexuals are described as someone who is only attracted to one sex, be it male or female, so they're can be gay monosexuals and strait monosexuals.
It's a bulked word, meaning it can be another way of saying on is gay and has no feelings to the opposite sex, as opposed to bisexual, which is the sexual attraction to two sexes.
As for "self-sexuality" I would treat that more as vanity than anything else.
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