I heard that purple rain means "sperm". I never thought of it that way, but it kinda makes sense because it is known that many of Prince's songs are dirty. (e.g. "Erotic City")

Purple Rain is a sexual act much like a Golden Shower, except the woman committing this act is on her period.

When a person drinks beetroot juice before urinating on the face of another. Causing the urine to be of a purple colour.

Hot steamy post handjob ejaculate from an erect purple-headed male member.

African American jizz

A woman's period.

Having sex in your own vomit; or someone else's vomit. It doesn't really matter.