I would have to say that the Adult dating sites along with the interaction of mainstream dating sites. I see the Adult dating sites even breaking down into niches so you can have several of them....."lardassdating.com", etc....
www.adultloveline.com is making my webmasters rich world wide! webmaster can sign up at
http://www.lovedollars.com and the traffic keeps going and going and going...!! Make no mistake about it, baby