What makes an ad for 'period-proof' underwear too risque?

The founders of Thinx set out to change women's lives by creating the perfect "period-proof" underwear. But when it comes to advertising a menstrual product, sometimes things can get a little messy.A socially minded underwear manufacturing company, Thinx launched in January 2014 with the goal of making menstrual leaks and stains a worry of the past. After three years of testing and research, it had developed a comfortable antimicrobial garment that it claims can absorb two tampons' worth of bloo...