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my mouth doesn't really open wide enough to give good BJ's...ive compared with my friends and i can really only open half as wide! so i can really only do just the head. anyone else have this problem? can it get better over time??
I don't think you have anything to worry about. The fact that you are asking the question on how to "get better" says a lot. Blow jobs are 5% technique and 95% enthusiasm. The head is all you really need to take. The rest of the shaft and balls can be taken care of with hands, lips, tongue and a naughty smile.