Crotch shots are self-destruct buttons

During our Karate classes, we referred to crotch shots as Kidney shots. For two reasons: 1) The place that's been attacked does not hurt at all, but the kidneys hurt, and I am repeating myself here, AS HELL, and 2) We had other local names for the shots, but we preferred not using them because a 'kidney shot' could well be used in front of girls and teachers(either gender) alike. Also, no one ever wanted to be the wuss who got hit in the crotch, so 'getting hit on the kidneys' was a good euphemism.

Kidney--I mean-- crotch shots: are they cool or what? Whenever the heroine's being kidnapped and the writers are running out of ideas, there's always the good ole' crotch shot, the Deux et Machina that never fails. What is so cool about them? Why's everyone so pumped about the phenomena, and why do practitioners of serious marital martial arts consider winning a fight because of a crotch shot so disgraceful? Also, when Bhim hit Duryodhan on the crotch and killed him, why did Balram want to kill Bhim? Was Balram one of those homophobes who had not caught up with his brother's more progressive ideas, and had to be explained the concept by the Lord Krishna's Birat form himself ( itself? herself? I'll never understand poly-sexual deities) ?

Scientists believe that crotches are self-distruct buttons for human males. Since evolution favored them with greater physical strength and agility (ladies, it's because of the hormones), they(or I should say we, but that sounds like that it's all my fault, so lets go with they) soon realized that they could easily overpower the women. So for those times when the gents got too molest-y for comfort, nature developed the self-destruct region for use of the females. Quick, simple, and effective. Throughout the ages, this idea has helped balance the forces of yin and yang, darkness and light, good and evil, Apollonian and Dionysian, male and female, those who have a vulnerable crotch and those who don't.

Of course, there are other related issues we could be discussing about, but right now I want to address a serious issue that has buggered humanity for millenia and millenia.

How on earth did people discover that that area was the particularly vulnerable region?

When we were at school, there were several fire alarms and axes and hammers and extinguishers. They all had simple instructions: In Case of Emergency, Break the Glass and Use the Device. Use Heavy Things, like Bricks, sticks and Stones (which apparently are just as useful during times of Emergency as they are in breaking bones and bullying as a whole, which I think is a proper art, but lets not go into such controversial issues now) To Break Glass.

So, where do the instructions for the crotch area come in? There's probably an instinctive instruction code inside our brains that says 'Hit There. Apply Concentrated Force to Cause Maximum Damage. May Cause Impotency and Other Fertility-Related Diseases, But He's Totally Asking For It.' Alternatively, maybe there's some kind of sign there, some kind of a signaling method or something, that attracts other people there, that tells people that it's a region everyone should attack and--- Umm... Never mind...I've totally run out of ideas. I don't even remember how I was planning to complete that sentence. Dumb me.