Birds do it, bees do it — but how did 3-ton dinosaurs with sharp, pointed spikes on their backs and tails get it on? …

“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.” …

Heinrich Mallison, a scientist at the Museum of Natural History in Berlin, has developed computerized models showing the numerous positions available to lusty dinosaurs. …

“These prickly dinosaurs must have had sex another way,” Mallison told the Times. “Perhaps the female lay down on her side and the male reared up to rest his torso over her. Other species would have used different positions, like backing up to each other.”