AdultWork - Hard to remember now, but I think I was Googling 'escorts' and clicked on a link to the website. I thought it was better than porn, when I first discovered it. I realize now, that you need to read to between the lines, with a lot of profiles. However, it is still easily the best escorts website available.
UKP - I was Googling an escort I had seen via AdultWork, to see if she advertised elsewhere. It came up with a UKP review for her. I was soon logged out, so decided to join, so I could read her other reviews. (Plus reviews of other escorts).