Any woman who has a functioning uterus has, at one point in time or another, gotten blood on some piece of clothing she likes. ALL blood is miserable to remove. Peroxide is one of the oldest tricks in the world and yes, it foams up when it is applied to blood, just like if you pour it over a wound.
Why are you boys so squeamish about a little blood. Many of you howl for more at MMA matches or a particularly vicious hit in football, yet three or four drops of menstrual blood send you screaming out of the room. Ya fucking babies