Supermanket is a dating site where women are clients and men are products.
Women go shopping men, which means that women select men to talk to. If a man has not been bought, he can't speak to that girl.
It is free. The guys does not receive payment. Guys can pay for a better position in search results.
It is as easy as to go to a supermarket, select a guy from the shelf and start chatting to know him.