First a story, that is true, then my experience..
At University we had a group of guys who hung out together in a loose collective. We had silly frat like rules i.e. to the bar at opening time whatever else was happening. So Nigel, in his bleary eyed, post-previous night party pulled a woman state, awoke and realised he was late for the lads. Rushing to dress he dashed to the bar where about ten of us had gathered. As he approached we all burst out laughing one by one...his moustache was caked in dried blood....
When he got the message it was his appearance causing the mirth he dashed to the toilet, spent a few minutes doing best to clean up, and returned somewhat sheepishly to the group, to be mercilessly ribbed by his so called mates.
Personally never had a problem with sex, oral or other when a woman on her period...usually them who are squeamish...I say all natural! And tastes sort of iron-ey - I found..not unpleasant if not as lovely as pussy honey!
Hell, if she will I will...only fair! And if she doesn't want a day or two wait is no biggie eh!
The good news is I learned early to make sure to check the mirror after!