Why does it seem like women tend to "overrate" their own attractiveness while men "underrate" their own?

Anonymous
+I am not saying every man or woman follows these behavior patterns but this seems to be the general case.
+Women tend say they can't find an attractive "enough" guy while men tend to just say they can't find a girl at all.
Updates
+1 y
*As an example a woman on a dating site who is clearly overweight will describe herself as slender on 'body type' when clearly thats not the case.
Why does it seem like women tend to "overrate" their own attractiveness while men "underrate" their own?
20 Opinion