Do girls tend to go for guys that are 'wanted' by other girls?

My mother always used to say to me that 'girls don't want the guys that other girls don't want'. I believe that girls tend to go for guys that have been with women before thus the approval from other women is the main factor in dating a guy. This is also evident in the amount of times girls want the guys that are already in relationships...a good place to look is amount of threads on here about this subject. Do you think this is true?

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