Quite possibly! That's the extra dimension added to the experiment. :) It would be even more fascinating if you could cluster facial expressions or motions as

Quite possibly! That's the extra dimension added to the experiment. :) It would be even more fascinating if you could cluster facial expressions or motions as "more female" or "more male". And for bonus points, work out a way to "filter" or "smooth" the facial signal to reduce/remove these giveaway hints (or insert false hints).