My company often sent folk to Singapore - and if they did something inappropriate and it was discovered - the result was often immediate termination. This included drug use (even if it is legal there), underage girls, bribes, kick-backs, and drunken parties.
I don't know about the other items on your list, but I assure you that drug use is illegal there, if by "there" you mean Singapore. I'm assuming you mean recreational drug use, not the taking of aspirin.
Yes, I was referring to recreational drugs. If hashish, marijuana or whatever was available there; and you decided to indulge, your job was in jeopardy.
In many companies, especially when dealing with Asian clients, image is everything.
If you come off as a drunk, pot-head or are known to frequent prostitutes - your company’s image suffers as well. Now, there is a gray-area a mile-wide. If you go to a topless bar with the client, you may buy them a few drinks, maybe a nice steak dinner (and some of these clubs have fabulous meals). But, it stops there. If you want to tip the ‘help’, you use your own money. Plausible deniability.
But, if they send a woman to your room - and your boss finds out - so ends your career. If you paid for a woman to go to your client’s room - and you paid for it with company funds - expect to go to court.
Now, did a few guys hire hookers with their own funds, and do this discreetly? Absolutely. Did everyone? Nope, but a lot of them did. But, this was highly discouraged, very dangerous and professionally risky. But, I’m sure it happened.