An open challenge

A new challeneg for life. Hats off to anyone that can achieve it. You must have sex in cement that hasn't set yet. It will be fraught with danger, as you will never know when the cement will set (DANGER MAKES PEOPLE HORNY!). And once you're done, you'll have a nice outline of your bodies. Kinda like a "I waz 'ere" thing. Except you would be pointing out outlines of your mangler (or whatever you call your genitalia)