Always disagree with that. I get that is the definition, but it is a poor definition. Especially since they are used to organize the searches.
Under a proper system, searches would work like this. But if I want bro-bro action, you would search brother yaoi if you want sis-sis action, you would search sister yuri if you want sis-bro action, you would search sister brother
But instead we use incest sister search, but this will also pull up yuri in searches. or mother incest, and again we might get mother daughter action, when someone only wants mother son. - actually trying to search specifically for mother-son incest is hard, unless you include -yuri in the search, but then that will exclude any story that includes any amount of yuri action in the story.
The sister definition is, Any sexual situation between a female and her sibling(s). The brother should be basically the same. Any sexual situation between a male and his sibling(s).
We have yuri/yaoi tags to show same sex relationships.
Heck just looking through it, there seems to be somekind of discrimination in the male tags being overly gay related, while female seems to be more open.
daughter - Any sexual situation between a parent and their female child. mother - Any sexual situation between a female and her children. father - Any sexual situation between a male and his son.
Doubt this will ever be fixed. But really should be.
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