Funnily enough (or not) the only men-only event I've done was a Bobby Moore cancer charity 5k. (You could smell the testosterone! And I won!) The only reason I did it was because it was extremely local, and a female friend was doing the R4L event at the same time. (And it was a good cause for paying my entrance fee and raising a bit for charity.)
I'm not totally anti- the idea of women-only events but the whole business of only women being allowed to partake in R4L events to raise money for a breast cancer charity strikes me as a little odd. Never mind the small number of men who suffer from breast cancer as well, it seems to give off the idea that if it's only/mainly women who directly suffer from it, it's only of interest to women to raise money for it - and the corollary with men and prostate cancer - as if there aren't husbands, sons, brother, sisters, wives, girlfriends and friends who wouldn't like to get involved as well.
Edited: 12/02/2013 at 15:19