I do wonder how profitable it is to have those fake lesbian relationships for Shiina because the girls she "dates" always seem to appear in the same films. She also doesn't seem to interact with them anymore when the last dvd hits which just makes it all seem even more fake.
Do you really find it odd?
It's normal for those who were in relationship to not work together anymore after they split , there are various example I don't know much about Japan , I don't speak the language , but in western porn this is the regular behaviour not only those in relationship often work together sometimes exclusively but they always won't work togeher ever again for example Dana Vespoli married Manuel Ferrara , they had three children after they divorced they never performed together again even though as directors they do direct the other sometimes . Ferrara then entered in relationship with Kayden Kross they have one child , she would only work with him or in lesbian scenes. Georgia Jones was in relationship with Faye Reagan they worked together very often although Faye also worked with men but Georgia never did, anyway after they parted they never worked together ever again. I can add more examples if you want
It is normal for those in relationship to refuse to work intimately after a split up , actually this could be proof they really were together