What is THE EVOLUTIONARY ADVANTAGE...

of the ridge atop the PENIS?  I need to know.


Why not cant it just be a smooth transition into the shaft, like a Popsicle?

Natural History doesn't work like that, OP. Natural History can only make educated guesses based on whatever evidence we've managed to collect.

Science doesn't claim to have all the answers. Science just promises to do it's best to find them. And that honesty and humility is what sets it apart from Religion.