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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?