Every single blue BOFF I've ever recieved on my main char has been a female ferengi...all of them ugly.
I took me hours of cosmetic work in the character creator to make them passably attractive.
OTOH, they did come with some very nice abilities.
Curiously, my alt is a female joined trill. Every BOFF recieved, so far, has been a male vulcan. A girl just can't get a break!