Birds do it, bees do it -- but how did 3-ton dinosaurs with sharp, pointed spikes on their backs and tails get it on?
Very carefully, say some researchers, who believe mounting a female from behind would have proved deadly for the males of dinosaurs like Stegosaurus.
"The females could not raise their tails, because the bones at the top end were fused," Brian Switek, a dinosaur researcher and writer, told the Sunday Times. "Also, some species had lethal spikes on their backs, which would have been impossible to get past."
Apparently, Switek -- whose new book is "My Beloved Brontosaurus: On the Road with Old Bones, New Science, and Our Favorite Dinosaurs" (Farrar, Straus and Giroux, 2013) -- isn't the only researcher pondering the ins and outs of dinosaur sex.
Heinrich Mallison, a scientist at the Museum of Natural History in Berlin, has developed computerized models showing the numerous positions available to lusty dinosaurs.
His software models proved that the male Kentrosaurus (a relative of Stegosaurus) had a major obstacle to overcome; namely, castration by the female's sharp-spined back.