"I-I.." stammered Joseph in shock, not sure what to pick.
"C'mon," said Steve, "Pick anything." He paused and hastily added "But stay outta my crotch - I'm not losing my cock!"
"I-I'm not going to do that," replied Joseph, "I wasn't even thinking it. Why would I pick genitals?"
He paused, and everyone realised what he'd just said but before anyone could react, they all doubled over in pain, their crotches feeling like they were on fire. After a minute, the pain subsided and they were left sitting there in shock. The guys felt an emptiness between their legs, while the girls had distinct humps in their skirts (well, except for Sarah, whose skirt was now tented).
"Ah crap," all six said in unison.