Sex roulette sites rose from chat roulette; an idea created by a Russian high school student in 2009. Originally, it was not a platform for adult entertainment, but that was soon changed. The site was soon filled with nudity and the administrators took steps to eliminate the adult content, which in turn gave rise to roulette sites specifically designated for sexual content.
The idea behind roulette is simple. You broadcast your cam, and connect to others who are also broadcasting. If you don't like what you see, you can simply skip to the next cam. The other user can do the same.
The amateur roulette sites tend to be dominated by males looking for females. There are some professional roulette sites that feature only women, and after you browse the amateur site enough, you will find these sites refreshing. Personally, I think the professional sites are more enjoyable, but there is a certain excitement to finding a real amateur in amongst the sea of male cams. Give sex roulette a try and see what you think.