What an interesting - and relevant - thread!
I have experience of this myself; I used to be pretty handy with my fists and punched my way through a bouncer and out of a Soho rip-off joint (albeit with cuts and bruises), but that was about 25 years ago; now that I'm in my mid-50's the sense of self preservation way exceeds the desire to get laid for cheap.
However, my last wake-up call; the one that did the trick for me happened about 4 or 5 years ago again on an estate (sort of) - but I thought a decent enough area - by Hammersmith Bridge. Hammersmith side, Queen Caroline Street as if walking toward the Apollo from the bridge there are 5 blocks on your right.
This was an advert on Acemassage that ran for a while; usual thing pretty Asian picture, reasonable price quoted as "Hammersmith" I tried it, found it reasonable value so this was a return visit - only this time rather than my 5.00pm just as it was getting dark as per visit one, it was more 10.00pm aching nuts need a release time. Funnily enough I still felt fairly safe, but i did get that odd feeling - you know that sort of someone is watching me feeling? I know when punting we all feel that to a degree as we approach the door, but this was intense and i should have walked away - but i didn't.
So, door opens - familiar trick of nobody there as they are hiding behind the door, so i walk in to the lounge area to hear the door shut behind me. I turn around to see not the lovely smiley Asian girl I'd seen the first time but rather someone who'd pass for her much bigger, older and wider sister - "oh, is (can't remember her name) not working tonight?" says I wondering how I'm going to get past her to exit "she no work here now" "how long you want to stay?"
"Errr no I'd agreed to revisit (her) this evening, sorry she isn't here - thank you anyway" as I head to the door.
She grabs my arm to pull me back, "you waste my time, you pay me now".
"no, I'll just be going please....." I then realise she's bolted the door top and bottom so I'm trying to resolve that whilst in the meantime she is now screaming "you pay me you pay me or I call for help"
"no, I'm off.... " as I get the door open only to realise she is now on the phone i presume describing me - in Chinese - to whoever is on the other end of the phone - getting rather worried now I throw 2 x £20 at her (on the phone it was £80 I recall) which distracts her enough that I get outside.
I then see three Chinese blokes - none of them big, but moving quickly so presume fairly fit - hurrying towards me from maybe 100 feet away - luckily (I think very luckily) she shouts something to them and they immediately stop running, but continue to walk toward me - but now they are jabbering away, pointing at me. "sorry!" I shout (no idea why) and I run faster than I have for decades towards the relative safety (as i see it) of the Apollo.
Now, I don't know what would have happened, I don't know whether it was a deliberate set up - in fact I only know what happened - but boy did it shake me up.
I drive a nice car; nowadays when I punt - whether I drive, walk or take the tube - as I approach the area I ask myself "would i leave my car parked outside of this gaff?" and if I have even a moments hesitation i text the girl that I've changed my mind - quite often that is ignored, sometimes an angry/rude/sarcastic text back (or phone call back even) and once or twice a genuine "sorry you can't make it this time" response - where this happens I have tended to reappoint them - however, I won't just "no show".
Finally, I had a thing with a really nice good old WG in Shepherds Bush on a council estate that ended about 2 years ago when she retired - she told me that one of the reasons behind her retiring was that gangs of kids (13-14-15) were targeting the punters to her flat after they left - calling them names, throwing stuff etc - but for her the final straw came when they attacked one of them and mugged him - now, that could have happened to anyone and anywhere - but she felt that her bringing the punter into an area he didn't know etc was a risk and the last couple of times i met with her we used a hotel rather than her flat....
Stay safe one and all, stay safe....