In sex magick workings what’s being harnessed is the energy of ecstasy which is considered as much a manifestation of Divine presence as of physical response. So the notion of practices that detract from, let alone eliminate the intense pleasure generated during sex as tantamount to sacrilege. So this movement among Indian women to have female genital mutilation banned will likely find support among Thelemites.
Read a story about this practice and the movement to ban it here:
http://www.bbc.com/news/world-asia-india-35129466
thanks to Soror Hypatia for the tip!