I'm sure there are stats that prove it. I am also sure that there are stats that disprove it.
However, being male my theory tends to be this: (a basic example)...
Two women in the wrong place at the wrong time. One dressed like a "slut". The other one isn't.
Due to being in the wrong place at the wrong time, there are some male wrong'uns around.
Now, men are visually sexually attracted to women, yes? Due to being visually sexually attracted to women, this means that the woman with more on show is more appealing (assuming she isn't an absolute mutt, of course).
The woman dressed like a slut is now in the wrong place at the wrong time, and has gained the attention of a male wrong'un moreso than the other lady. Surely the CHANCE isn't equal for both of them?