Ramon
What you discribed seems alot like the style of Jui-Jitsu that I study, "Can-Ryu". We are taught that this is not a sport... but a self defense MA. Groin strikes, biting, using car keys or anything else we can find is perfectly ok. The name of the game is to live, unharmed while at the same time causing only enough (damage, or pain) on our attacker as necessary.
Where I disagree with you is on size.I am 6' about 210 lbs, my daughter is about 5'6 and half my size, but she can throw me, use a lock on me and when I get on top of her, she can can very effectively remove me 
Technique is the key.
PS. We are taught to never hit someone with a fist, the human head is 40 times stronger than a brick and all you will do is hurt your hand or get your attacker angrier. Open open strikes...rattle his head like jello in a bucket, palm strike him in is nose, finger strikes to his eyes,slap his ears causing the ear drum to rupture, jugular notch take down, or other pressure points.
But you are right...this has nothing to do with the topic
