@justforthelulz
lol that or he gets off seeing his wife with other men. I mean she did casually say that they would do it at their place.
Oh, or he was expecting some swinging action.
What if that Heizo-dono actually is an exceedingly understanding husband? He could be 100% impotent (Viagra doesn't exist yet), but he has a younger wife with needs. He could be trying to allow the wife to satisfy herself with safe partners. Of course he's not a fine man otherwise by trying to make other husbands betray their wives, but he could be looking after his own wife, after a fashion.
Of course, Chiyo will break that swing, decimate that playground, and throw sand in that THOT's eye. They can't even get down with each other, much less a freaky couple.