Depends on the guy. Many will fuck on your period (I have) but only a select few will put their face down there.
when she is on her period, she takes it up her ass. no oral down there, can't do that
Have no problem fucking a chick on period but like the others not interested in oral.
I eat my wife when she's ragging. She's always super horny then and we always do oral before we fuck so when she's ragging, nothing changes. I admit I don't swallow like when she not but as long as she's cleaned up, I don't mind at all.
I always enjoyed fucking when my wife got her period. Not into eating the red meat though.
I've done it. Not a problem with me at all. Most women are so hot during that time, they wanted me to fuck them, or eat them. I love how sexy and hot they are when I have sex with them on their period. Both of my wives have been into it. I'll take a horny woman anytime. ;p