Beyond simple barbs, penile spikes are sharp protrusions on one's penis that could prove dangerous for the receiving partner during insertion, retraction or possibly
Dec 30, 2008 For all species of the cat family, mating is painful. It's not the biting that hurts the female, it's the male's penis
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Yes, they do. All male cats have sharp backwords pointing spikes on their penis. When mating, the spines will scrape the walls of the cats vagina to cause ovulation. That's why the female cat whines during mating.
Mar 10, 2011 But fortunately for humans, the male penis evolved in one particularly nice way: it lost its spikes. Some animals, including chimps and mice, still have penises dotted with hard spines. But Stanford researchers have discovered one particular chunk of noncoding DNA that was lost, leading to the spinefree human penis.
Mar 09, 2011 How the human penis lost its turns on an androgen receptor at the sites where sensory whiskers develop on the face and spines develop on the penis.
Mar 20, 2009 white spikes on penis head there is no pain only the white" spike" things around the head What have I got? Thanks