If it was in a stack that was loaned I would imagine that it was meant to be viewed. Good thing that I would not be repulsed by most of my firend swaping bodily fluids. But I think i would view it as an anthropological study rather than an erotic persuit...Of course if I got a "chubby" while watching...
In short of course I would watch, until I couldn't stand any more.

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Sex is a tricky thing best left to professionals.