Hahaha these two are strange. I found some info at MTV.com. The two are stirring a lot of controversy in the US, but they're popular in Russia
http://www.mtv.com/news/yhif/tatu/
"none of the group's representatives will affirm that Volkova and Katina are the genuine article. And while the girls might love to kiss, they're not about to tell. "Every song is about our life," concluded Katina. "Everybody thinks we are lesbians. But we just love each other."
Riiight, lol. They're not lesbians, but they love each other and enjoye kissing each other, haha. Maybe I don't know the true meaning of the word, lol. They're music is very dancey.