Most Helpful Girl
In my personal opinion and experience, it's other girls/women that have created this. I remember approaching a boy when I was younger and it was girls who started laughing and being like "Oh my god, did she really just do that". And then came the looks of disgust from them. I was horrified!
Most Helpful Guy
I don't think that's the only reason. I'm sure a lot of girls don't ask men out because they fear being rejected, which serves to affirm their insecurities.