As with ANY industry, sex is always at the forefront.
Which industry was the first one to really make money with toll calls?
Which one was the first to make money with the internet?
I could go on and on but won't. Since the first caveman grunted to his buddy, "ugga ugga, look at those beautiful hairy tits bro", man has been obsessed with sex. Now sex is in the double latte frappucino mocha half caf espresso world with Sexpresso cafes opening everywhere.
With as many horny guys as there are in the world its surprising this didn't happen sooner.