In Manhattan there used to be "The Manhole" down near the Gansvoort area on Sunday afternoons. You drop all your clothes at the door. I had some good times there getting jerked off by several guys simultaneously.
This same location was an S&M/B&D club on Friday & Saturday nights and I also had some good times there.
On the street level in the same building was a gay club with a room down in the basement where guys could grope.
Unfortunately folks carried things a bit too far and one too many blow-jobs (which are illegal in public locations in NYC) resulted in all of it being closed down by the vice squad. :(
Now that I live in NJ I don't get in to the city to look for new locations. I'd love to find some bisexual get togethers out here though. Hug