That's just a reflection of a change in the online population. The typical user is no longer a young, white man, highly educated with lots of money. The Internet population is now more like America.
One is that people are just too busy. When it comes to the ranking things they actively do in their life, making sure their job situation and their household situations are in good order is a higher priority than going out and looking for dates.
The spectrum runs from the completely debauched, awful kind of stuff, to the most high quality, high tone stuff.