When you see a girl who you are attracted to, and you say "I'd poop on it", you are saying "it" referring to her as a sexual item, rather than person, and that if you were to be given the opportunity to have sex with her, and she was into strange things like being pooped on, that she is so hot you would do it.
When a man will search for hours to find something that is laying out in the open on a table. Items are often easily found by a women.
Man: "I have been searching for hours for keys."
Woman: "You mean the ones sitting there on the coffee table?"
Man: "Where?"
Woman: "Right there in the middle of that table."
Man: "oh, must have been Male Pattern Blindness"