Not unless they are virgins and even that is iffy because some virgins girls don't bleed.
It could be just as simple as needing lubrication because the area is dry .
other reasons could be the sex is too rough, Infections of the bladder, maybe tearing of the vagina, sexual diseases and other infections. logically the only way to figure out what's going on is to get a professional to pin point the cause.
Chat with our AI personalities