Never share make-up, and never keep make-up too long! It can grow nasty things! Just like we all have a unique flora of bugs in our guts, we also have a unique flora of bugs on our skin. Your flora and his flora might not match, so don't share.
Make-up is good for on-stage, but I'm not so sure about classes. A class is more intense than most performances, and the face, just like the body, sweats and secretes oils and make-up can plug the pores.
I have male friends that wear make-up, but not during intense workouts.
My recommendation, aside for some powder on the face to absorb oils, don't do the heavy make-up thing for class!
balletboy[/i]