Sounds like the documentary on Dragons, and how they mated while diving from a high altitude. Probably one reason why the breed died out.
This is actually how a lot of insects, like ants, breed in real life (though the altitude is only high relative to their size).
Fortunately for them, almost all animals can complete the act in a second or two. Humans are about the only ones who take our time about it.
Don’t stop, Rex
Don’t stop, Rex
Don’t stop, Rex.
BLAM!
In days of old when dragons were bold...