I grew up mostly in Japan, and did receive (like many young girls in Japan) offers of enjo-kōsai from older men.
It's basically the recognition (and acceptance) of the fact that young girls (above the age of consent) have things that old men want and that girls should be compensated in turn.
The Japanese are very practical about stuff like that and sex in general.
It's a transactional relationship that usually includes spending time with/going out with older men in exchange for money or luxury gifts.
It does NOT always include sex.
It has a long tradition in Japan but has become more controversial in recent years, as the country becomes more and more westernized, culturally.
I have done some enjo-kōsai, and some sex was involved.
Handjobs in cars, kissing, blowjobs and some fondling.
Sometimes we would just go to a karaoke bar, or for dinner in a nice restaurant.
It was exciting and enjoyable.
The men were grateful, polite, clean, very generous, and kind.
And there was no shame attached to any of it.
And I felt 100% in charge of the situation.
So there. Enjo-kōsai in 100 words or less

A man who lived at the house that faced our back garden always appeared to be looking to catch sight of me. In the summer when i would sunbathe in our back garden i could feel him watching, but not actually see him. Apart from when i was sun bathing on a particular weekend and i caught the glimpse of a flash when the sunlight catches glass or metal. I could see him in his bed room looking through binoculars directly at me. When i met friends and went to the park I’d see him there. I once went to my bf parents house and when i came out his car was at the end of the road. I know because of his cars this odd colour.

Then it escalated, he started saying hello on the street, so i felt i had to say hello back. I came out of the nail bar and saw him a few feet away. He complimented me on the way i looked and asked if i was going out with my bf that night. I was wearing  a low cut top and he couldn’t take his eyes off my cleavage. I went with a gf to a hairdressers that was out of town and found when i came out i could see his odd coloured car at the end of the same road. I reported it to police and they went to see him and found 100s of photos that he had taken of me. They also found that he had placed a tracker underneath my car, and that was how he was able to know where i was 24/7. Creepy. He was warned to stop that behavior.