User blog comment:B214/Volume 23 discussion blog/@comment-81.135.250.239-20170404000834/@comment-31137559-20170405002238

We have to consider that although this is a fictional series the culture and customs of Japan still exist. The students in the school are regular humans just like us. And they would disapprove of that kind of thing. Bring up polygamy to anyone you know and ask about their thoughts on it. The DxD Japan(non-supernatural) is no different than Japan in the real world. Polygamy is illegal in most countries and is looked down upon. And having multiple lovers at once is looked down upon in most countries. Well there is the supernatural aspect of DxD and the Underworld culture where polygamy and having a harem is acceptable, we shouldn't confuse that with the mundane world's culture.