The myth of cutting males in the desert makes no sense on its face. In windy, dusty and sandy conditions you'd WANT a very full foreskin... it keeps stuff out of your urethra (where it really hurts) and the mucosal membranes of the glans and inner foreskin are generally tacky enough that they prevent even a speck of dirt from getting in between. The more acroposthion you have, the better off you'd be.
And the thing that they're all seeming to forget? In these dirty conditions with wind, sand, mud, whatever else... they all have pants on, right?
So...obviously, the sand isn't going to get up there anyway, unless they're walking around with their penises out.