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You're missing the point. You get better by working on it with your partner at the moment. This doesn't require you to have 100 partners, just to be attentive to the one who's right in front of you. Books can help, but the real point is that every time you're naked with a woman you have another shot at learning how to do it better. But obviously you're intimidated or too insensitive to consider doing that, so instead you whine about numbers. It's not an attractive attitude and is the real reason you don't get laid.