Ya, he's a closet homo who's too insecure to try a relationship with an adult, and gets his kicks from sadistically torturing children. Besides, they're much more easier to manipulate(I speak not from experience! That's just what psychologists have said is the reason why pedophiles do what they do) And I say he is a homosexual because despite the two girls on his record, like you said, he did go back to Robin. Not only did he torture the poor boy from beyond the grave(episode in which Robin is assaulted by Slade hallucinations, that were activated by an outside signal{BTW, this is one of those episodes that made me hump the TV}) he also promised/threatened to pursue their "relationship" further in the "End" episode where they fight together.

Sorry, what were we talkin' about? Oh, ya, I'm glad you liked my soft porn. If you'd like the real, hard core stuff(and for free!) go to fanfiction.net and look up RobinRocks "Small Print". Although it's one chapter to finished, it's a ride you'll never forget. And not only that, but the characters are portrayed as they are on the show(something I prize highly in fanfics).

--
I don't get mad, I get stabby.
-Fat Tony

"Groan. Doing things is one of my least favorite things to do."
-B. Atropa