Oh I'm not sure either, jane and vamp, just interested. And yes, of course bullying must be tackled in every possible way.
On a personal level, I'm not sure I would have found dealing with sanitary towels more embarassing with boys around. I had three brothers and coped fine at home. I learned to be discreet. I actually wonder if most boys wouldn't be too embarassed themselves to say anything if they noticed. The teenage boys I know now are very down to earth about such things and would, I think, just look the other way.
The other people hearing one 'go' thing applies whether there is anyone within earshot, doesn't it? Not sure the gender of the ear, so to speak, is relevant. I once read a very interesting account of overcoming that embarassment too. Since reading it, about twenty years ago, I've just thought "to hell with embarassment about normal bodily functions!" Works a treat. I recommend it. 