Thanks for posting the link to the Tatu site. I was about to do something similar.
All Madonna was doing was ripping off the lesbian pop duo Tatu, who always end a singing performance by kissing one another.
Here's an article about it,
"Tatu Out Madonnas Madonna"
http://www.moviecall.org/updates/index.php?article=867
I am not sure, but I think thanks to Madonna girls kissing girls may have jumped the shark.