I actually met my fiance off of plentyoffish... ya I'm cool I know!
She's pretty hot (she models), is very relationship oriented/devoted, smart, and gives great head and loves getting phucked like a dirty whoore. She even took a chance on dating me back in the days when I was stripping fulltime, did drugs frequently, partied a fair bit, and was quite man-whorish. I consider myself pretty lucky finding her as most of the girls I've met on there weren't that attractive.
I'm a pretty horny guy so I have pretty low standards for what I stick my weiner into, but really high standards for girls that are "relationship quality"... I think I got at least some form of action (meaning my cack in at least one of their holes) w/ at least 80% of the girls I've met on POF.
In my experience, if you're attractive and in great shape, have a photographer take promo/modeling pics of yourself w/ your shirt off. All my pics were promo shots as I didn't really have any other pics at the time. Assuming you're on that site to get laid, these pics will really help your chances. If you're not in shape... then get in shape... it makes getting laid A LOT easier.