I keep noticing this bit of sidewalk stenciling in front of a house on Valencia between 20th and 21st.
It’s not in S. Pigeon’s “Codes Of The City” guide, so I can only assume that this is the meeting place of an underground club where swingers try out all the latest non-standard sex positions. You heard it here first. Knock on their door and ask for an application if you’re interested. (Don’t really do that)