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References on dinosaur sex

Seriously, folks I recall a paper on the structural difficulties of how 
dinosaurs had sex, particularly bipedal dinosaurs.

It is non-trivial because many species have thick tails.  This would make 
it seem unlikely that they could twist their tails together the way lizards 
do.  Also, the bipedal dinos would have balance problems.

I don't have the reference any more.  Anybody remember this?