GaijinPunch said:
Isn't the sex industry the biggest in every country?
Er.. not really. In most European countries, "paying for sex" is still taboo (contrarily to Japan), and apart from a few brothels in a few tiny areas of big cities, it's virtually inexistent (or completely hidden). In Japan, you can find soapland and "special massage parlours" around any big station, and nobody raise an eyebrow. Strip bars are apparently common in big US cities, but apart from a few in Paris and London, I haven't really seen any in Europe (and it's certainly not the kind of place to which you go with your friends or to entertain a client, like I see in Hollywood movies or TV series).
As for porn, it may be also developed in the West, but to no extent like in Japan. Enter a combini and half of the magazines contain porn. In quite a few Western countries, porno magazines are usually sold in special 18-only shops. In others, they are sold more openly at the news agents, but only make up less than 10% of all the magazines, contrarily to about 50% in Japanese combini (porn manga included).
Add to this the "love hotels", which are also part of the sex industry, and exist almost only in Japan (well, there are motels in the States, but in Europe, it's rather unusual to go to a hotel only to have sex, except for extramarital affairs).
Then we could add the hostess bars and "snack", which aren't exactly "sex industry" but closely related. They are everywhere in Japan, and I had never heard of such things in Europe.