I've had women have there period in the middle of having sex a bunch of times. First time it happened I was like: Why is there blood on my dick, and thought I had cut my self on something, then I went down on her and could taste pennys.. so I was like ohh. She did not seem to care or know, I did not say anything because I did not want to embarrass her
Oh yes, thanks for reminding me. Been there, done that, had that taste also. But I don't have a tee shirt proving it.
I have no aversion to it. On some partners I have even performed oral sex during their period and thoroughly enjoyed it. Some women are too self-conscious though and want nothing to do with sex (oral or otherwise) during their monthlies. As far as blood on the dick or your mouth, it washes off just fine. No biggie.
I started a thread on Taboos and as I looked this up a few minutes ago, found it was/is a common taboo in various cultures. I forgot to give myself credit for it!