They did it in public. Didn't anyone discover them? also, y the heck did they get a dick p...

I feel like it was their version of a couples ring

Also part of the "treatmeant". He can get aroused with out the food issue. He only get aroused after eating so the peircing kind of helps channel or well trigger him. Like at the office he wasn't eating but he felt aroused... then had lunch and let all go.