ruby fountain
Ruby Fountain is a sexual position in which the female companion squats over the other person's face, allowing her period blood to drip into the other party's mouth, thus creating a fountain of period blood - also known as a Ruby Fountain. This is a practise typically used by lesbians.
Jane: Me and Sarah did the Ruby Fountain today!
Mick: Ew, Gross!
Mick: Ew, Gross!