So many interesting threads to pursue here. Let's begin with the Netherlands and male prostitution.
I've never been to The Hague but I've been to Amsterdam twice. Of course I had to see the legendary red light district. What struck me most was how clean and wholesome it was. The streets were clean and litter free and it looked like any other business district. Except the business was sex. Looking around at the people on the street, of course there were single gentlemen who were there to look over the wares on display and to perhaps avail themselves of the professional services being offered. But there were also couples there on dates. Couples of all ages from teenagers to senior citizens and everything in between. There were also families with small children. It looked like Disneyland with whores. I could just visualize one of those little girls turning to her mother and saying "Oh mommy, I want to be a whore when I grow up."
Like you I have heard that in the red light district there are now "window boys" in addition to "window girls", but I didn't see any. But I cannot imagine that male prostitution does not exist in the Netherlands. Hell, it exists all over the world. There is nothing to stop a gay man from selling his body and I'm sure many find it exciting. (More about this in the next paragraph.) There are also a lot of ostensibly straight men who will engage in sex with other men for money. (Gay for pay.) Often they will only assume inserter roles, the most frequent being the hustler allowing the gay man to suck him off. But for the right amount of money, nothing is off the table. Or in the case of the guy I took home, no money at all, just a handmade handicraft item. Another thing I'll note about that encounter is the he never took off his pants and wasn't even crazy about me feeling his cock thru his pants. He was just giving me oral service. He approached it in a very businesslike way like a short order cook preparing the perfect eggs over easy. He was very good at oral service and I could tell he had done it before.
Now about gay men prostituting themselves, I once had an encounter with a gentleman whose mother was a whore. He grew up in a whorehouse and he thought paying or getting paid for sex was totally normal and natural. It wasn't like he just blurted this out in the first five minutes, but it came out in bits and pieces over the course of our afternoon together. I didn't pay him anything nor did he expect me to (our encounter was for fun, not profit), but he was quite candid in saying that being paid added a layer of excitement. "I'm going to have sex anyway, why not get paid for it?"