Like it or not, women are judged sexually in society. They are also judged on what they wear, too little and they are sluts, too much they are frumpy. Work wear is a minefield of getting it just right to avoid inappropriate comments and not being taken seriously or appearing 'frumpy/unattractive' and not taken seriously. It's not right but that's how it works. So on a dating profile, the photos put up give the only visual image of how you are and viewers will form an impression.
Personally, any of the following pics will get a man dismissed on a profile. Holding a fish = stupid
sitting on a 'fanny wagon'* = sexist arse who thinks he is paying for it
torso shots unless they are on a beach or something = not Brad Pitt drunken photos with his mates = not my idea of a night out
comedy hat = stupid sense of humour
I could be wrong, but it's my reaction. On fb, it wouldn't make the same impression as most people are just throwing stuff up there, not advertising themselves by selecting photos which they think represent them.
I wouldn't wear a low cut top to work as I would want to be taken seriously and have the meeting listen to what I'm saying rather than stare at my cleavage. So with OD, if I put up a range of pictures of me doing the pout, wearing my bra and a thong** in the bathroom mirror (shudder), taken so high you could see the unflushed turn down the toilet pan I would expect a higher than average number of men assuming that I was up for 'fun' and possibly a photography lesson.
I'm entirely with Bant on this one. I also think it's offensive to imply what he said means he thinks along the lines that women deserve to be harassed or assaulted because of what they wear.
*yes, that phrase was used in a seminar by the lecturer, I was the only woman on the course
** I don't do thongs.