Haw! I'm just kidding with the picture above, but it does serve to make my point...that female models dominate art school classes, and not just for the obvious reason.
Female silhouettes follow lyrical, curved lines that begin at the head and follow through to the feet. They're beautiful, no doubt about it.
If more evidence is needed I refer you to the comparison above.
My own solution is acting. I picture gifted amateur actor-models working in twos, one male and one female. A story outline dominates the session.
It could be a comedy...
..or a drama.
Or some combination of the two.
A script is okay, but I picture improvised situations based on a loose outline, spoken dialogue only if it feels right. A whole story or fragments of different stories. The important thing is that whatever fragments are used, they should lend themselves to visuals that are fun to act and fun to draw.
It would be fun to alternate comedy with drama, or solos with match-ups. I could see a male actor doing a solo variation a bit like Chris Crocker's "Leave Britany Alone!" Of course you'd have to change the timing to freeze some of the poses and give the class time to draw.
I could see a solo woman doing a sketch like Bette Davis's "I wipe my mouth" from "Of Human Bondage."
Probably the sessions I described would work best with draped models. I'm not sure amateurs could act with their clothes off. That's no problem because I'm not trying to replace classical nude model drawing with these actor sessions. Students need both.
Is that all? Mmmm...no, wait a minute, I forgot something: a good homework assignment for a session like this one is to have the students draw up one or two carefully finished drawings based on the sketches done in class.
I'm a cartoonist so I see this assignment done in a cartoon style like the one above.
Lots of styles would work.
BTW: that's not my drawing above. I wish I'd copied down the artist's name.