Some countries just aren't right if your aim in life is to have optimal sex, even some Southeast Asian countries. The crux is: you don't know which ones are right, and which ones are not so right.
To find that out can be very expensive. You cannot judge the sexual prospects of a country by reading about it on the Internet. The point is: different authors have different ideas about optimal sex. When some write about "girls", they mean "hookers". And when other authors talk about the "friendliness" of the people of a country, they don't mean sex.
I can define what I am talking about: definitely not hookers; also not other women for whom locals have little inclination to compete. "Optimal sex", as I define it, is sex that is based on genuine sexual appetite of both participants (not the sex you get when the female partner is interested only in money); it is sex with local women for whom local men have a great deal of appetite (not with women of low sexual market value).
There is no other website that compares Asian countries from that perspective. I know it because I myself regularly try to get hints for free on the Internet... and such hints have led me to terribly wrong places.
I spend a lot of time researching where the best sex is available for me... and I can tell you: that is an expensive kind of research. It is expensive because you cannot be a tourist at a place that you research for sexual purposes. Ordinary local women at many places (especially places with a good number of tourists) do not consider tourists as sexual partners, and rightly so.
Only the hooker type of sex is available for tourists. But I am only interested in sex that is accompanied by aspects of love. No local woman with a little bit of insight will allow herself to fall in love with a tourist... so for the tourist, there won't be sex-love relationships, but only sex-money relationships.
To test the waters for sexual relationships that are based on love, you have to be able to refer to a permanent home. If you genuinely are a house-based or apartment-based foreign resident in a country, not just a hotel-based tourist, your prospects for local love relationships are much, much better.
I have rented "permanent" accommodation in almost all Southeast Asian countries... and yes, I'd call this my most expensive hobby, because occasionally, I use the facility only a week or two, and then come to the conclusion that, sorry: wrong place (once again). But I won't know before having tried being a genuine resident.
You can decide not to become a member of this site. That saves you 200 euro (at the time of this writing). You can go to different countries, and take a look yourself (based on what you read somewhere else on the Internet). The chances are about 90 percent that you are wrong... that you select a sub-optimal place. The 200 euro you saved won't even pay the first month rent of where you try your luck as a foreign resident.
In the non-member articles, I am very careful not to give any indication of what the best places are. That is the one thing that is strictly reserved for members.
If you are a member, you can ask me by email what is best suited for you, depending on criteria such as age, race (sorry, no prejudice on my part, only on the part of local populations), looks, education, and language skills.
If you are serious about searching for the best sex in Asia, then my member articles, plus a few mails from me, will save you thousands or tens of thousands of euro, plus months or years of fishing in poor waters.