Problem:

As the old joke goes, "God must have been a civil engineer.

Question: Who else would put a waste facility straight through a recreational area?"

But maybe it wasn't God. Is there any evolutionary reason (or background for) having the urinary duct and reproductive organs right next to each other (in both humans and many other vertebrates)?

To be clear, I'm not asking why isn't it elsewhere. I'm asking where the original "design" came from that spread everywhere.
Please give detail about this.