Ha. You reminded me I actually did that once. Cycled over to Streatham pissed one night. Got a shit blowie and handjob in an alleyway. Cycled home. As LLP said, I thought the action got closed down on the High Road / Tooting Bec years ago.
Like with all street prostitution it moved but didn't stop, same as when Kings Cross got redeveloped, sure the WGs moved away from the station and around it but reappeared a mile or so away.
Nearest I came to a punt on a bike was this old woman came up to me offering a BJ with the selling point that she had false teeth so can really DT, and this wasn't even in a known RLD. She looked like a victim of nuclear fallout so I quickly rode off.