What is the woman-on-woman version of grinding?

Scissoring, but I don't think you could get away with that at most clubs.

^

I've seen it happen...
but had to be bare ass naked.

Tribbing

I had to look that up on Urban Dictionary but yeah.

Lip reading

If I recall from the last lap dances, about 10-12 years ago which I saw wife get at the old inner room cabaret, the dancer took off her top and sucked on her nipples. My wife reciprocated. She also seemed to spend a lot of time rubbing her face on my wife's private region, judging by the amount of make-up wife had smeared all over her sun dress. When they came back to the bar the dancer stuck her forefinger in my mouth and said you recognize the flavor right. Wife held up 3 fingers, one for each dance related orgasm.

I think ski nailed it.

In “Lower mileage” clubs, women always get more action. Dancers that would never allow nipple sucking and DFK with guys, seem to freely offer it up to the ladies.

Skibum you married well

Dancer puts a hand between the receiving woman's legs.

At Chicas Bonitas a year or so back, there was a woman getting a lapdance across from me, she was wearing a skirt and had her knees up in the air while getting grinded on. Hot as hell, it was all I could do to not stare.

Tribadism