Despite who brought it up, it defies physics. How is shit going to get from the back of the drawers to the front? The average flaccid is between 2-3 inches long. I will ask that ex the next time we speak, knowing that he has worn boxers, briefs, boxer briefs and gone commando, if his dick soft or hard has ever reached behind his nuts and ended up in the crack of his ass. Hard, it's certainly long enough, but not flexible enough, to my memory. He was my first love, so he's pretty memorable to me. Even though I taught him only moisture could prevent skid marks, I didn't know about them being a problem for him until he mentioned it, even though we had sex constantly, often when we were both unwashed, starting in the summer when we began dating. And aren't most people taught by parents how to stay clean? If the suggestion was Gardnerella vaginalis, Lactobacillus, Prevotella, anaerobes, Mobiluncus, Bacteroides, Peptostreptococcus, Fusobacterium, Veillonella, and Eubacterium, which smell like fish, not poo, if the suggestion was built up smegma, which smells cheesey, it might make sense. But shit? No, that seems highly suspect, and even if sweat carries some forward, it's gonna get trapped behind the balls. And even so, just wiping dry will leave some behind, maybe even enough to leave small stains, but enough to make a penis smell? No. That doesn't hold water. Do you just let someone tell you something illogical without challenging it? I don't.