You do not have to be strong to beat someone who is sexually harassing you. You just need to know a few steps.
These are pictures of an instructor teaching a woman five defense techniques in 1931:
1- If the harasser is grabbing you from the palm of your hand, hold it with the other free palm and pull both hands to your chest to the level of your shouldres. This will free your hand.
2- If the harasser is grabbing you from both hands, bend forward, raise both hands with your palms to the outside and pull them.
3- In case you want to attack the harasser before he attacks you, grab his hand and press his thumb to the outside while pressing his palm with your other hand to the inside and bring him down to the ground.
4- If the harasser attacks you from behind with his arm around your neck, hold his arm from the elbow, slightly bend forward to the right or to the left and pull him. He will fall to the ground.
5- Another technique is to hold him from his chin, place one foot behind him and push. He will stumble.
Edited translation from Al-Masry Al-Youm