Recently I came to the happy experience of reading a book by Robert T. Bakker. The man who founded my love for dinosaurs in the first place. There I was introduced to the theory, that Tyrannosaurus Rex used its wee little ( but still quite strong) arms to tickle its mate in order to suggest mateing.
And I dont know about you all, but the idea of Tyrannosaurus Rex being open for nonthreatening physical touch in order to show affection makes me more than happy.
Maybe all a female rex wanted, was a partner that could make her laugh.