Don't really get, what cha mean ;P Yuri ist just the same as Shoujo-Ai, but with sexual Content.Yuri and Shoujo-ai in combination is the best genre. ;D
Actually, the japanese people don't use Shoujo-Ai like the western ones.Yuri is the act only, while Shoujo-ai also shows the emotions for each other, I think. ;D
Isn't it's like that?
Best example is Shoujo Sect Innocent Lovers.