Hear me out. There’s nothing innate to an object that makes it “food”. It’s an attribute we give to certain things that meet certain qualities, i.e. being digestible, nutritious, perhaps tasty or satisfying in some way, etc. We could really ingest just about anything, but we call the stuff that’s edible “food”. Does that make it a social construct?
I was actually speaking about the biological classification “sex”, not the act! I hadn’t thought about the act as a social construct, but I guess it obviously is. I’m reminded of the old lesbian conundrum: “Was what we just did ‘sex’ or…?”