"Steve?
"
That's from a slogan among the gay-basher Christians in the US, "God made Adam and Eve, not Adam and Steve!"
"didn't they determine a few years ago that all humans can be traced back to 7 females through MDNA?"
That is only the mitochondrial DNA, that is passed from your mother's mother's mother's mother's.... mother. You still have autosomal DNA from your mother's father's father's mother's.... mother, who is not one of the 7. The Y-chromosomal DNA (father's father's...) likewise goes back to only a limited subset of the males who lived way back when.