Most Helpful Guy
I'd generally avoid it but I did date one who did that to her inner thighs when she was a teenager. Thankfully she gave no signs of ever wanting to do it again and became a very mellow person (though she smoked a lot of weed). If I dated a girl and she did that during our relationship, I'd probably be tempted to break up if she refuses to seek professional help.
Most Helpful Girl
I'd avoid it because of very personal reasons..