Because it is a fact that as a woman it is more difficult to get a date in an environment full of women. I know, this is not evidence based info, it came from conversations with "expert" friends of mine. ;-) I am talking by ear here. I know some women who explored unimaginable areas and places to get a guy and they did. Particularly one went to work to a part of my country that has more men alone, so they are more prone to date and commit, she said. She considered herself unlucky until she moved there. I do not want to disclose her previous misfortune but really she had not done well in the dating area when she lived in my city. Oh, also she moved to get better job prospects (what she did, btw) of course, I do not know statistics about cases like that