Just to let you know two things:
If you switched the genders of the Joker and Harley Quinn and changed absolutely nothing about their characterizations, I doubt that the majority of people who are so anti-JxHQ on this site would give half a crap about fem!Joker abusing male!Harley.
If you made Poison Ivy a male and changed absolutely nothing about the characterization or M.O. of seducing people with pheromones other than the fact the targets are now women, Ivy would be one of the most hated characters on tumblr.
Just saying.