In case a woman gets raped , she is considered guilty of adultery unless she can provide four adult muslim male witnesses who had watched the action and who would testify that the sex was actually forced on her and that she was not a willing partner in it. If she has only female witnesses in case she was raped by an intruder in front of her fellow wives and slave girls or in a women’s dormitory full of women witnesses then she is out of luck. Her punishment is stoning to death if she is married or hundred (100) lashes if single.

A 19 year old girl was gang raped repeatedly by six momins in Saudi Arabia recently and was given a punishment of 200 lashes and six months prison ( the punishment was increased because it was a gang rape)

USA Today

Report: Saudi gang rape victim punished

RIYADH, Saudi Arabia (AP) — A Saudi court sentenced a woman who had been gang raped to six months in jail and 200 lashes —more than doubling her initial penalty for being in the car of a man who was not a relative, a newspaper reported Thursday