We're beginning to understand the genes behind how men lost their dick spines. In fact, smooth penises are a derived state in humans; many if not most mammals have some level of spikiness or roughness on the penile tissue. We've known that chimps have penile spines since 1944! However, no one's really quite sure exactly why humans lost their spines. [more inside]
Researchers have found that size does matter as it relates to overall proportions of the male body (PNAS link, PDF)
Nature constantly engineers new and creative solutions to all sorts of problems—turning our stereotypes about sex upside-down along the way.
Carl Zimmer on the duck's incredibly long, corkscrew-shaped, ballistic penis.
My tale is rich with deep scientific significance, resplendent with surprising insights into how evolution works, far beyond the banalities of “survival of the fittest,” off in a realm of life where sexual selection and sexual conflict work like a pair sculptors drunk on absinthe, transforming biology into forms unimaginable. But this story is also accompanied with video. High-definition, slow-motion duck sex video. And I would imagine that the sight of spiral-shaped penises inflating in less than a third of second might be considered in some quarters to be not exactly safe for work. It’s certainly not appropriate for ducklings.[As Carl says, video links are possibly NSFW.] [more inside]
Possibly NSFW: The human penis, its life cycle, size and myths about it, why it looks like that, what can go wrong with it and last but not least, the anatomy.
Why is the penis shaped like that? [T]he human penis is actually an impressive “tool” in the truest sense of the word, one manufactured by nature over hundreds of thousands of years of human evolution. You may be surprised to discover just how highly specialized a tool it is. Furthermore, you’d be amazed at what its appearance can tell us about the nature of our sexuality.
This news item turned out to be a hoax. Has Reuters been fooled again? I certainly smell a rat... (I know the original mefi link pointed to the BBC, but the BBC picked it up from Reuters)