To hate date is the sexual equivalent of having a "frienemy."
It's part masochistic and part
lazy, but it always means that you hate yourself and the other person and are allowing the relationship to be dragged out. The purposes of hate-dating is for the sex, which can range from satisying to ok to laughably
bad. You might
keep the person around because they're fun and the sex is wack, or the sex
game is good and the person means shit to you.
If one person is
cheating or trying to degrade the other to gratify their own insecurities, and/or if the relationship has been drawn out and on the downturn, both parties are hate-dating. For highly dysfunctional and broken
people, all they know is hate-dating, because it's a place to dump all your fucked up unconscious feels at once, affirming the way you feel about yourself and the opposite sex