Profoundly creepy and indicative of overall poor mental health is how I would perceive that.a One Night Stand between Jason Todd and Harley Quinn would be an interesting angle for a Story about the Trauma caused by Joker and I'm surprised it hasnt happened yet
Doesn't help that they've toyed with several hero hookups with Harley in various realities. Including implied with Dick I've heard (haven't read), which I loathe the idea of.