Upon finding myself sat on the floor in a circle of people, one by one being handed a plastic cup of unknown content, I assumed I had inadvertently joined some sort of death cult. It was indian ink, which turned out to be much more fun than mass suicide.
If you're out and about, maybe going to get some eggs, I would by and large recommend that you avoid talking to the naked man. However, if you are in a life drawing environment, I'd say go ahead. Life models are people too.
Life drawing with paint? yes please. the more mess the better! I tried using masking tape instead of drawing the figure, filling in shading with paint, and then removing the masking tape. Much fun had.