I don't. Mainly because i'm too shy about my period, I just don't want him to take the condom off and it's full of blood! yuckies!! Even if I took it off in the end, I just don't like that "gushy, overly wet" feeling! I have tried it a couple times and I just don't like the feeling! It's probably because I bleed ALOT when I have my period and I just don't feel too turned on...well at least not during the beginning!! And in the shower is out of the question because he could see it....
sorry, it's just me and my "yuckies"...