There's a comic series ( brothel girl comix ) of this exact mishap. Her more recent silly web comic. They're just little funny relatable slices of work life. In the comic when the man kicks up a fuss saying how disgusting it is she says 'how old are you' he says 41 and the comic girl gives a side eye to the camera so to speak lol.
If men are having sex with a women and find blood inexcusable at the age of 41 it's laughable because it literally happens, it's not we set out on that particular day like oh gee i want to bleed on someone today that'd be fun and not mortifying at all, I guess if you don't have a vagina they don't understand the schismatics of how we don't know we were bleeding (we can't feel it or predict it like a fart lol, especially when other lubricants are happening). It's one of those things that can't be helped. If all goes to plan and we take our week of work during our period great but sometimes the utereus is like SURPRISE MID BLEED DAY FOR NO REASON, change of medicine, diet, stress or literally no reason. Our services is as close to porn you can get so customers often expect that perfection but we can't have real life cut scenes where we just pause the booking without them knowing to rectify a bad position, a bit of blood, a queef, a giggle, a gross noise, an ugly face like porn can. Think of all the things that get chopped out of porn, they film for 3 hours & end up with a 25 minute film. They're having sex with a human being, a female one at that, with a reproductive system that sheds the lining when there is no baby. If they want to avoid i'm sure women who have gone through the menopause would be more appropriate. I completely respect if they say 'Oh i'm not into period play can we call it there', but not when they BLAME you for the blood.
Ironically i've seen women dragged for bleeding and men call them 'greedy for working on there period' - When we work on our period there will never be any blood because we expected the blood so have a barrier in place. It's when we're not on our period that random blood happens (spotting).
It's in no way just an escort thing either because i've had multiple co workers / friends have blood mishaps on their clothes.
A part of being good in bed isn't just knowing some kick ass positions, knowing exactly how to work the shaft/clit etc. I'd say it includes being cool about the mishaps, having a giggle when things go wrong instead of being naive. If it's all in making another person feel good... just as we don't go EWWWWWWWWWWWWW GROSSSS when there's imminent poop from anal clients. That would be highly shit thing to do in the bedroom no pun intended.