Don't push this all on the girls! Any boy could dress up as a girl convincingly enough to fool the magic and lift the branch himself. The only reason they did not was because they would take a similar status hit as the girls would for giving away their magic for free.

(More practical advice from an unwillingly celibate lesbian who is as disgusted with the idea of getting touched by dudes as you: learn to masturbate, and/or seek ways to relieve or avoid other types of stress that exacerbate the problem.)