I mean, he loves Batman becuase well he is to much fun.
But does this guy feels any romantic things?
Not for Harley for anything, i mean he is pretty much demisexual, still i dont see him feeling romantic love.
A demisexual is a person who does not experience sexual attraction until they form a strong emotional connection with someone, often (but not always) in a romantic relationship. The term demisexual comes from the orientation being "halfway between" sexual and asexual. Nevertheless, this term does not mean that demisexuals have an incomplete or half-sexuality, nor does it mean that sexual attraction without emotional connection is required for a complete sexuality. In general, demisexuals are not sexually attracted to anyone of any gender; however, when a demisexual is emotionally connected to (usually in love with but sometimes feel strongly as friends) someone else, the demisexual experiences sexual attraction and desire, but only towards the specific partner or partners.
Also Rape isnt about sex, is about violence, for the same is easy to explain why The Joker can rape people, becuase, well he enjoys pain and violence, so it makes sense that he rapes, but id dont think he enjoys sex.