I wouldn't know, I seldom read het, overtones or not. Though yeah, Babs/Dinah's pretty scarce. Which is insane. Everyone knows they're stupid in love, yes? It's one of the most widely "yeah, I totally see that"-acknowledged non-canon ships I've seen in femslash. So why are there not more stories? (Not that I'm one to talk, with my ten or twelve WIPs that will never, ever get P'd to completion, but still.)
It's a sad combination of fandom being what it is (not much of an audience) and there not being any new canon for them to gay up. But if it's any consolation, we can at least get some schadenfreude from the dearth of Dinah/Ollie.
Of course, in a perfect world we'd send fembuck in for a doctor's visit with nothing but old issues of BOP to read and watch as a new fandom was born, but I suppose it'd be cruel to get her into Babs/Dinah after how Rachel/Ivy panned out.
Heh. You're such a guy.
Seems to be the prevailing opinion. That would be an interesting poll, tho. Because if you're looking for 1:1 characterization, a lot of Bruce Wayne smut just wouldn't happen. Ditto for Harry/Draco and such. Maybe there's an Uncanny Valley of in-characterization and hotness. I've noticed there's a certain amount of forgivable OOC in writing comedic fic and especially crackfic, maybe there's something similar for porn.
If Hal is different because she's thinking in terms of variety, though ("Ollie slept with someone else, but it was a guy, and a boyfriend provides different things than a girlfriend so I don't need to feel threatened"), then Dinah will be fine and Babs is going to be the real sticking point.
I think in a fic like that, the one with the most sexual hang-ups is going to be seen as the bad guy, so it'd be most interesting for everyone to have their own little issues. For instance, Dick is (if not strictly monogamous) Mr. Relationship, and Dinah would be weirded out by her fuckbuddy sending her flowers and wanting to get in on Romantic Movie Night with Babs. And Barbara has control issues and Teh Paranoid, so she'd probably try to ritualize things to keep from anyone getting jealous or hurt and thus suck all the fun out of it. With Dick and Dinah, she'd be putting round pegs into square holes (when she should be putting round pegs into round holes, hur hur).
And I could see Dinah as distinguishing between Hal as the friend with benefits and herself as The Girlfriend, the one who Ollie comes home to, the mom to Roy. So when she finds out that Dick is Robin of Batgirl And Robin, she might freak out wondering if she's the friend with benefits in this little equation.
So, lotta ground to cover before everything's beer and pizza.