Sure, in Bangkok where they bang cock. In the US, there is a famous brothel outside of Reno called the Moonlight Bunny Ranch. You can have a threesome with a mother and daughter who are willingly doing it for the money.

you are going under the premise that what i want people to do to me is the same as what other people want people to do to them.  False premise, it works much of the time but we all aren't that similar that we all want the same thing.

In a round about way that's called survival of the fittest. Many (not just a few) think survival of the fittest is the best way to go because it puts the stongest individuals at the top of the pile. Hence if you believe very strongly in survival of the fittest you can live by the golden rule and justify comitting tyrannical acts by saying "if someone is in a position to bring me down then they should, because it means they are better than me and deserve to usurp my position".

Do unto others is a good starting point, but it's not the entire solution.

Odd that you should criticise religion while promoting the virtues of the GR. Over the millennia it has been religion that has exhorted people to follow the Golden Rule more than any other philosphy or ideology. And the golden Rule has its origin in religious scripture. In fact the Golden Rule is, without exception, a unifying factor for all religions.

If there's a philosophy that promotes itself as a religion and it doesn't have the GR as one of it's central tenets then it's not a religion. For those who are religious it's pretty much a test of whether something could be a true religion or not. Of course if you're not religious, or you're anti-religion then this is irrelevant fantasy.

I don't know where you get the idea that living by the GR suggests you can engage in illicit drug use or prostitution. If you apply the golden rule to the use of illicit drugs then you quickly come up against the sorts of behaviours that are harmful to other people aznd thus violate the GR (even with a totally legal drug like alcohol there is a great deal of harm done when people are in a drunken state that they would never do sober). If you were to think deeply on the GR you would come to the conclusion that the only way to guarantee that you always live by the GR is to live a life of total sobriety. On the matter of prostitution I imagine if you were to ponder the GR a while you'd also be lead to conclude that prostitution is incompatible with a life dedicated to the GR.

On the other hand if you are content with abiding by the GR most of the time, but not all the time, then you'd be able to fit illicit drug use and prostitution into the time when you exempt yourself from the GR.

Also the GR suggest that you must not troll or flame other people on internet forums. Especially if they own/prefer a gaming platform that you do not own/like. In fact you should refrain from making any disparaging comments. You don't have to be complimentary or force yourself to say nice things, of course. Like everyone's grandmother says "if you can't say anything nice don't say anything at all". Imagine if this forum lived by that "rule", which is really an extension or corollary of the GR. It would be a so much more pleasant and peaceful environment. Though it might get a bit boring. And the mods would have nothing to do.

Do unto others as their evil twin would do upon their mother

You can't know that. You really can't.