Never been to Thailand. If it is prostitutes he lives near central London..surely prostitutes are available there?
Yes but you will pay London weighting and get London attitude.
Over in Thailand your money goes a lot further, so you are free to have a whole sex holiday with plentiful women making you feel like a king, rather than some sticky doorway transaction as a dirty old punter.
And, as the women are more desperate (In greater numbers and without the support network of even a benefits system) well....you can ask for whatever it is you like can't you? Because more than likely they'll say yes.
You only have to read those dire punter type websites to see the way they speak about the Thai and Filipino girls being so much more accommodating and feminine and submissive than us Western vipers.
Also Pattaya is full of the same kind of man, which means they convince each other that what they are doing is normal. And that of course, they are "supporting" these girls and women.
I know because my slimeball ex FIL lived there for 20 years "supporting" a woman 40 years his junior.