Reminds me of a film I saw a little while back of women being enticed to participate in a chalenge in some sort of club. The challenge is to expose themselves nude to poisonous spiders.
The main character does it and saves her friend in the process.
I got the idea from a trailer of a tv show where it just showed the legs in the mirror. Wanted to go a step further and made this story of the girl wanting to get into a secret society where she has to perform some emberassing and/or difficult tasks.