I just want to say that “get fucked” is a somewhat offensive term imo 😅 It implies a power dynamic where the man is doing the fucking and the woman only gets fucked. I think a better way to ask this would be “Why shouldn’t women fuck…” Or “have sex” etc 😊

As for your question, generally speaking there is no absolute reason not to have sex during your period, but there are some things that can make it harder/unpleasant for some period having people ⚧️

• The blood adds friction, so you might need more lube to keep it pleasant
• the vagina might be sensitive so it might make it painful
• the cramping and general symptoms of a period might just make them not in the mood for it, but it could also do the opposite and make them horny.
• And obviously the blood can make the sex more messy.
• etc

So very individual, i would just define it as just a situation that is different from the “norm” 😄

And a quick note about culture. There are many cultures and religions that define the period as “dirty” in some way and some even go as far as forbidding a man from touching a woman if she is on her period. Fuck that misogynistic bullshit.