Pucker Up

I startled a co-worker the other day with my whistling. He was not, however, as you may have assumed, overcome with shock in regard to my prodigous talent--he was just shocked about my gender. Hmmm . . . that didn't come out quite right. Before you judge (I feel I may say this without undue bragging: I am quite obviously a girl--no ambiguous squinting necessary), let me explain. Turns out that he grew up on an island off the coast of Brazil, and it was accepted in his culture that only men whistled. He's never even heard a whistle from his own sister. Wait till he hears the rendition of Fur Elise that I've been working on! :)P.S. You know how curling your tongue, attached earlobes, etc., are genetically-granted traits and all that? Is whistling? AmBEAR and I were debating this along our Crow Creek trek last week. If so, then how come I can whistle, but my IDENTICAL TWIN CAN'T? It's a puzzle.