This is, you know, kind of obvious? Just about all of us have heard guys finishing declarative sentences with a high rising terminal? Even if it's more embarrassing for them than it is for girls? We're talking mostly younger men and teenage boys? But sometimes men in their forties and fifties too? So it's just kind of a stereotype we've projected onto the opposite sex?
Also? I've heard the Frank Zappa/Moon Unit Zappa song "Valley Girl"? There's hardly any uptalk in it? Maybe the headline is a little misleading?