My brother, back when he was a biology major, did an experiment in oiling mouse balls. Only PETA objected to him using mice, so he used his friend Tom. For weeks Tom went around with the front of his pants all oily, slick, and exuding a definite odor (my brother used WD-40). For some reason people avoided Tom, including his own mother. The lesson learned from the experiment was that if you oil mouse balls, Tom pees down his leg because he can't keep ahold of his pee-er.

This experiment did not make the peer-reviewed journals and the knowledge sits unknown on my brother's bookshelf, such as it is.