Go down to Lex & 28th after 11 pm some night.  While I don't endorse other boards, there's information on SWs in many different areas of NYC on worldsexguide.com  

But as for what you specifically refer to -- the "tunnel girls" who strolled and trolled the West 20s over by the entrances to the Lincoln Tunnel in the early 90s (prior to Giuliani's clean up)-- they seem to be gone completely.  There used to be hundreds of them on a Saturday night, many of them extraordinarily gorgeous.  I used to live in Jersey and would drive in to work early.  At 6:30 or 7 am you could see them on a summer morning winding up the night's work on 30th Street and 11th Avenue, wearing nothing more than bra, panties, a garter belt, hose and heels. I could go on at length, but to summarize:  the typcial deal was a cbj for $20 right there in the front seat; for $60, you could cruise w/ the girl down to a friendly parking lot on 23rd, slip the attendant a five and park in the back, and she'd do FS in the front seat; and for $100, plus 30 for the room, you could go down to the Liberty Inn and spend all of 10 or 15 minutes with her for FS.  If you were nice to her and lucky, she might take her clothes off.  

It was rough and ready, but oh what a thrill!

-- Modified on 8/9/2004 2:51:33 PM