2,119. Three Women Sharing a Garment or a Bed
Hilchos Issurei Biah 9:31
Let’s say that a tall woman wears a cloak that belongs to a short woman and a stain is found on it. If the place of the stain is adjacent to the borrower’s genitals, she is unclean. If this is not the case, she is clean because the stain came from the short woman.
Hilchos Issurei Biah 9:32
Let’s say that three women wear the same cloak one after the other and a stain is later found on it, or they all slept in the same bed and blood was found under one of them. In such cases, all three are ritually unclean. If one of them inspected herself right away and found herself unclean, the other two remain clean.