I don't think it's the clothes or lack thereof......it's the personality coming through. I've seen pictures of beautiful women and thought....eh...because it might as well be a mannequin. Other times, you see a picture of a fully dressed woman and think....oh my god! I bet she loves sex....or I bet she loves to have fun. There are beautiful women out there by the millions, but some can tell stories through their poses and others cannot. That's why some models become supermodels and others are just beautiful women walking around town.
Personally, I like women who look like they're having fun in what they are doing. I like to see an enthusiasm....in this case....for sex. Everyone can do the poses on all fours and such.....but few can make me think she was thinking of me while the picture was taken.