Sixty Days and Counting by Kim Stanley Robinson

on a rave in Solona beach:

... it was true in the Belly-Up of the beast, in the cacophonous sweaty strobed space of the rave, there were plenty of alternative life styles being enacted right before his very eyes. Most provocatively in fact. Some very serious kissing and other acts, dance as simulated standing sex, heck actual standing sex if you were at all loose with the definition.

p. 118

I've been there and done that, but not recently. Maybe I should keep a closer eye on the schedule for the Belly Up.