There is no doubt in my mind that the first thing both Jandi and January did when they left their respective shoots is to look for the number of a good chiropractor or masseuse.
Their necks and backs were clamped and trapped in thick iron bars and twisted, contorted and placed into near inhuman positions. Alternatively, one might view this shoot as an initial experiment into finding out just how twisted up and tormented each woman can get before it prevents them from being made to orgasm.
More data on this to come......