I know a large number of middle aged or elderly white guys going to Mexico, Brazil, the Philipines, Thailand, Myanmar, Laos, Cambodien for sex.
A retired English guy, in his 60s, told me he had thought about going to Thailand to bring a Thai boy to live with him in England. He's never married and never had any relationship. He told me he had been lonely all his life.
I'm not sure they go to these countries because they think the boys in these tropical countries are hot, or simply because these countries are poor and the boys are cheap. What's special about the boys in these countries that attracts these white guys to travel so far for sex?
Most likely: both. Plus the fact that you can combine some inexpensive vacation time and escape the freezing or wet winter.
If cash is your first and foremost concern, travel won't pay off, for the sex alone. Every major city in the northern hemisphere has a number of 'working bois', 'escorts', 'rent boys', too. Sure, their rates are higher, due to the higher general purchasing power of the population there but all the other expenses: travel, hotel, transport, restaurants, etc., are saved, too.
Escorting is not for everyone just as escorts are not for everyone either. I would stop short of calling it 'sexual slavery' by all means. People mostly have choices, when it comes to such things. And many guys really do choose to be 'working bois'.
Why?
Everyone has his own story to tell. Yet few things are very common:
They view sex as sex. The choice of partner(s) is not their predominant concern. Yup. There are guys, who can have sex with anyone, age, looks, and other physical attributes notwithstanding.
Sex pays off much more than most other unqualified work: 'It beats flippin' the burgers by far'. Many guys tend to see it as an alternative to the daily 9-5 grind or even as an important secondary source of income that allows them the little luxuries of life, otherwise fully unattainable.
Doing something that is barely legal but deemed undesirable for males in most societies gives them the idea of taking a kind of 'shortcut' and coming closer to their dreams. This is, of course, mostly an illusion. But ever so often, illusions play the decisive roles in our lives.
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Many guys out there, most of whom are not 'workin' bois' are frequently looking for 'daddies' with some sugar on them, too. And some of 'the older guys' are only too happy to oblige.
Just like with the escorts, this is not for everybody and not every dude is meant for this either. But it does work for many men and I have seen a few very successful relationships of this kind over the years.
SC