Answer
When you touch a woman anywhere on her body without her permission , you are violating her gender as a female. No person has the right to touch a woman unless they want to be touched. You don't have to make a big production based upon this answer as most people will understand that touching a woman without her permission is a violation of her gender.
umm. don't do what was suggested above you may go to jail ! as man you could dress in drag that would be the best. cry at a movie or any of may things think what girls are normally like vrs boys and then do that
Get a friend that is a girl & if it's ok w/ her, grab her butt in front of a bunch of people. Note their responses.
Be sure to try and get the femael's consent before your decide on your experiment. If you must do this for a class then ask one of the females in your class if they would assist you in that capacity.