Its not going to be the be all and end all. Like any technique you have to apply it well, and also avoid anything he is doing to you. It is never as easy as "I'll just do this and it will all be over".
But there are lessons for grapplers. The more programmed you get into sports grappling, the more opportunities to groin grab (or eye gouge or bite etc. etc.) you will miss, and the opportunities to do the same you will give to the oponent.
But someone would have to be wearing some fairly loose trousers for you to gte a good grip in the nether regions.
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