This is just one of many weird, weird turns that Batman has taken over the years. Here's a list compiled by Cracked, with the "Rainbow Creature" at #1. And here's another. (They're totally gay-bones for Batman over at Cracked.)
My first sexual feelings, at age 3: watching a Batman & Robin episode (live-action B&W--that's what was on TV in Outer Mongolia in the mid-70's) in which Robin was tied up & hanging from something, waiting for Batman to come rescue him. I mean, come on.
Eh... I prefer to think he's just not motivated by sex. With Robin, i.e. "boy I adopted and indoctrinated into my insane crusade (and whose crime fighting alter ego doesn't wear pants)"... there might be something sexual going on there but I'm not sure it's a good example of what we call gay. Creepy, hell yes. More pedophilic/self-aggrandizing than gay, though, I think.
I've always thought so. He's some rich bachelor who houses this twink who's a circus performer and no doubt has remarkable flexibility. He's always turning down Catwoman and ladies at cocktail parties.
Wasn't this more than implied by the SNL parody, Ambiguously Gay Duo?
http://www.youtube.com/watch?v=ZEAYcR8w_…