Hmmmm. Not a bad idea. I may try priming the canvas with a black-pigmented gesso if I decide to start another one. And yes, most folks would consider me quite kinky. Cum painting is one of the milder sexual activities in which I engage. If I ever get it finished and published, there will be a LOT more stories in my memoir of my sex life.
I have never seen this before. I figure you must be kinky and a little freaky to come up with something like this;) I hope you take that as the compliment it was intended to be.