The fourth [consideration]: Sexual impurity [janaba], referring to the penis, which occurs by the coming together of the two circumcised parts and the emission of semen. ‘Aishah (may Allah be pleased with her) said: Whenever the two circumcised parts come together, washing becomes obligatory; I did that, me and the Messenger of Allah (SAW), and we washed ourselves. By “come together” we mean the bringing into alignment, for indeed the woman’s circumcised part is above the opening. It is said: Two riders come together when they align themselves.
The meaning, then, is not the circumcised part per se; for if the head of the clitoris is cut off, the circumcised part becomes hidden just like the remainder of the clitoris, and likewise if someone penetrates the vagina of a dead person or an animal, or in other than the front, in which case there is no circumcised part. And regarding the obligation to wash a dead person a second time if they have been penetrated, there is disagreement.