I had assumed already that it would be the same-sex doing the pat-downs, although that would still be a no-way if they are allowed to touch my breasts.
I can seriously cry on command so when I refuse this x-ray I think I will demand for them to publicly mortify me, tears and all.
Some of the screener are professional, but there are horror stories at the Flyer Talk forum of some on a power trips and will gladly mortify you.