If this were a light novel the title would have been: "One of my 25 new wives is actually quite lewd, but I am too much of an idiot to get that she perverted to the core."
@strider_01 - Let's be real, though. If he was that worried about birthrates he could easily offer migration to the nerds around here and quickly solve the problem. myself included <_<
If we're coming up with alternative titles, how about "I'm way too insecure about myself and too socially incompetent to just talk to my wife like a normal person".