By Teirra Kamolvattanavith Since opening in 1956, Lumpinee Boxing Stadium has become one of the world’s most prestigious sites for Thailand’s martial art of Muay Thai. But the venue in Bangkok has traditionally forbidden women from fighting there—or even touching the ring—due to entrenched superstitions about menstruation and its potential to “pollute” the sacred space. Signs placed around the ring are clear:…