That's entirely the point of pornography! FANTASY!!! We may have sex with our partners when they are on their period because they get exceptionally horny then (or at least my ex-wife did) but that does NOT mean we want to see it in a fantasy scenario to jerk off to! it's messy and stinky. Same with 'discussion of content' and 'natural' bodies with stretch marks from babies, her going to the bathroom after sex to pee out your wad, etc. FANTASY. sigh.