After spending many nights awake racking their brains while watching reruns of Jurassic Park, paleontologists are finally confident about their theories on how dinosaurs mated back in the day. Here's the description, via The Daily Mail:
'All dinosaurs used the same basic position to mate,' said Dr Beverly Halstead, an English researcher who was one of the first to tackle the subject. 'Mounting from the rear, he put his forelimbs on her shoulders, lifting one hind limb across her back and twisting his tail under hers.'

The physical challenges involved must have been formidable.

The penis of a tyrannosaur is estimated to be around 12 feet long.

'The most likely position to have intercourse is for the male behind the female, and on top of her, and from behind, any other position is unfathomable.'
And to help the rest of us visualize this tender moment between two extinct creatures, the experts decided to include this artist's interpretation of how your favourite dinosaurs mated.  Warning: What you are about to see can never be unseen.