Plenty of the girl on girl oral stuff I watch has the girls licking the outer lips, not much fingering, and the girl receiving is acting like it's the most erotic thing ever. But when I watch a guy go down on a girl, the guy is usually way more into it, face fully into that pussy, a finger or two working in, actually trying to give her pleasure. I wouldn't find some girl on girl action where the girl giving is actually into what she's licking instead of just wanting to give us a show.