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Ok, it's not a labia subject, but it's still a female sexuality subject.
I have found this movie on the web. The lady is a french gynecologist name Dr. Odile Buisson. She works with Dr. pierre Foldes who, in France, repairs girls who have their "clit cut" in Africa.
Of course the movie is in french, but anyway, it's just to have a look on how the clit moves during intercourse.
First she show us what we all now know: the 3D anatomic picture of the clitoris
Then, their are four movies.
1) echographic movie with a moving finger in and out in vagina. The view is a transversal one. 2) the same but in 3D and we have a good understanding of what happens with the clit legs and with the clit shaft. 3) echographic movie during intercourse 4) the same in 3D
It speaks by itself and you don't need to speak french to undersand why intercourse gives clitoral pleasure.