Well it sold tATu (and the Japanse copy (they even did a cover of "All the things she said" - it's just variety, do you like your lesbians Russian flavoured or Japanese flavoured?)) rather well.
Incidentally, on the topic of Ninja Lesbians, I demand everybody track down "Karakuri Ninja Girl". It's an anime, it's... a hentai that's 3/4 comedy. Completely awesome, and provides great "special moves".
"Ninja Bedroom Technique... Spectral Penile Shape!" *note: they used the word penal, which is very different.
"The Secret Sword, Shadow Destroyer!"
Mixes lesbians, ninja and comedy.