In Japan many woman are self conscious about the shape and color of their nipples and vagina.
That's why oftentimes they undergo a vaginal reconstruction surgery including vaginal bleaching.

After the surgery they join online support groups where they ask unknown men's opinion about their rebuilt and bleached vagina before showing it to their beloved one. Men providing such feedback are seen as very valuable by these women.

This hobby of rating post op pussies is called "tsukurinaoshita manko no kanshou" in Japanese!