Humans: "So wait a minute, we put what in where?"
Finnos: "Erm... the act will be enjoyable?"
Humans: "Why in the world did you make the same things we expel our waste from how we make new humans?"
Finnos: "Erm... Childbirth will be painful?"
Humans: "Shit, we pissed off the gods."

Only a god would have the right mind to mind to decide to make a recreational area run alongside with a waste and sewage dump.