What are the situations in which a woman is in a state of major ritual impurity (janaba)?

A woman becomes ritually impure (junub) in three situations that she shares with a man: the emission of semen while awake with accustomed pleasure, or its emission in a dream, whether with or without pleasure, or the meeting of the two circumcised parts during intercourse. She also must perform ghusl (definition) (ritual bath) upon the cessation of menstrual blood or postpartum bleeding, based on the Almighty’s saying: "And if you are junub, then purify yourselves."