The Secret Next Door

don't, if anything these manga have taught me is that the husband is probably fucking a co-worker and ignoring his wife. He gets what he deserves.

Maybe she is a lonely widow?

You also gotta factor in that alot of japanese males have phimosis or aren't circumcised. Another thing most of the males if they're in college or the work force I believe they only bathe out of their own volition and not a daily thing like those of us in the West or other type of countries that bathe regularly.

I agree with Smuggins.  The Japanese bathe or shower at least once a day, so they're actually
very clean.  The prevalence of "stinky dick" in hentai is a reflection of the Japanese obsession
with every aspect of sex---all the smells, tastes, and sounds (especially the sounds, hence the
profusion of sound effects in hentai).  Body odors are exaggerated for erotic effect in the same
way that dick size and cum volume are exaggerated.

ahem, (puts on glasses), I think this is an interesting point. But I think that it depends alot on several factors. Bathing, personal chemistry, cut or uncut, and finally social stereotypes.

Personally, I think the last one is the real culprit, with the idea of an exaggerated smell giving the signal that he is virile. Similar to how the amount of ejaculate is exaggerated, the idea is of detail is to emphasize cultural ideas about virility and masculinity.

depends, considering japan, pretty sure that stuff is made of biodegradable plastic XD.