Are there any internet ads?

-Hoot.

Don't know them either, but the last time I heard of that rate in Chinatown for F/S was 6 years ago.

they're generally wrapped up in too much unsavory activity. I would think thrice before accepting.

Too often places like this offer only the above! Where the other party squats over you and does some up&down movement. The only contact is you-know-what!
If you go in with that in mind, then you shouldn't get hurt!