bolmo: Sp cq sexual transactions

1. How, specifically, do street prostitutes and clients negotiate and complete sexual transactions?

Sometimes through drugs, other times with money.

2. Do clients solicit prostitutes on foot or from a vehicle?

Both.

3. Where do the sexual transactions take place?    

Inns or hotels nearby.

4. Do prostitutes and clients take precautions to prevent sexually-transmitted disease?

Sometimes. There have been rooms where protective measures were left behind, but it isn't guaranteed to be every time.