Well, some people/cultures are more sensitive to things like this, while others just marry cousins off with no problem. Even if not by blood, they are technically brothers/family by the marriage of their parents. Some people just look down on that, and Japan tends to be a bit more conservative when it comes to love in general. Hope that helps a little.
Japan is a traditional country.Being traditional is pretty obstacle to accept new things.Maybe thats why they dont allow the siblings marriage or maybe their perspective of family is a little different.Tho I'm not sure(?). But cousin marriage is legal if im not wrong. (〜￣△￣)〜
i guess that being raised as brothers makes people forget that they aren't blood related. As it's weird to be attracted to someone you lived with, and grew up with while thinking that they were your sibling
Omg, this statement got me wondering what countries allow sibling marriages, so I googled it
https://en.wikipedia.org/wiki/Laws_regarding_incest (⊙…⊙ ) eh （￣へ￣）
To OP, you can keep shipping your kids together
The ideology of incest has only become unacceptable in modern day society. Actually in the past 200 years to be exact. Before, it was not uncommon for a relative to wed another relative in order to preserve for various reasons. It was actually very common among the aristocracy. I personally think the change happened around the time America was colonizing the world but, that's neither her nor there. I however do not know exactly why or how this change began to happen and in such a large scale at that.
I believe where I live it is illegal to marry first cousins and maybe even second cousins because of the blood ties. I would probably have to look this up and doublecheck it. I do know though that while it is frowned upon and not socially acceptable it is not illegal to marry step sibblings. My mom's sister married her step brother. Of course they divorced and remarried and divorced again, but they were still able to
Now for Japan, and I know someone else already pointed this out, but I think cousin marriage is acceptable. Now as I don't live in Japan I'm not certain. I would think the issue with step sibblings and blended families would mainly have to do with the family structure and being raised along side each other. The emotions and arguments and sibblings rivalries that can go into it.
As you said yourself, your kids are all in their 20s, but imagine you lived and raised them together since they were children, or teens? Would you have been comfortable with your teenage stepson sneaking into your teenage daughter's room at night to have sex, while you were non-the-wiser?
you've got a point here...
I think it also depends on the individual situation. If the stepchildren are adult (or near enough) that they and the respective parents don't view them as actual siblings it won't seem weird emotionally. But if the children are young enough to form an actual sibling bond emotionally, then while it may not be incest technically it has the same emotional impact. In the end, as someone who has whole, half and adopted siblings, all that mattered was that we felt like siblings, not the degree to which we were related by blood. But I can easily imagine that should I have suddenly in been introduced to a new older "sibling" by marriage in my late teens or early 20's, if of the opposite gender and attractive, I doubt I'd been thinking of him as "brother".
Surely I don't understand some social or cultural issues but there's one thing that makes me curious and it shows in many yaoi mangas: those "brothers". Their parents married but the boys were total strangers, not connected by blood, only by their parents' marriage certificate. So how are they brothers and where's the problem? In many countries even real cousins can get married, I mean I'm not talking about gender or anything, but the problem of those family connections really is hard to understand for me. I also have kids and a stepson (they are all in their 20s), and he never called me "mom", because I'm not his mom, he calls me by my name and it's absolutely natural. If my daughter (or son) and my stepson wanted to be together, it would also be ok... Why is there a problem in Japan? Could anyone explain?