The subject has always been a spiny one…let alone the problem of size and the (sometimes) the spikes! Her are a couple of my solutions. The first one is this couple of T.rexes having fun and putting their puny forelimbs to some use (as hooks to grapple their partner)… here’s the sketch where the previous illustration was based:
But the really thorny issue is tackled in these next two unpublished sketches where I have tried t0o solve the very popular issue of how Stegosaurus had sex… my solution was pretty basic: there’s ONE obligatory point in their anatomy where the two animals had to meet at all costs (that is: the cloacas). I reconstructed the anatomical possibilities of the posture of the rest of the bodies around the united cloacas instead of going other ways around. Of course I had to take in consideration how flexible could have been the tail with all those big plates on top, holding it stiff… the tail could not flex down, but it could go up and down and sideways fairly easily!
I came with this solution (obviously there have been challenges to it and anyone is welcome to propose even more challenges!), There’s also the distinct possibility that they also had some sort of penis (and since penises don’t fossilise we don’t know how long that could have been). In any case, I thought it was a remarkable exercise for expanding and challenging anatomical knowledge. How do Stegosaurus had sex? very carefully! I’d like to leave you with an old, famous image that only Ken Carpenter dared to publish in his book “Eggs, Nests and Baby Dinosaurs” by Indiana University Press. It is indeed the Joy of (Carnotaurus) Sex…!