Actually, you CAN make yourself more sensitive by overstimulation. However, it's usually an unpleasant feeling and you wouldn't want to have sex at all if you were over stimulated.
You can also "train" yourself to reach orgasm too quickly by masturbation just the same as you can "train" yourself to last longer. If all you're after is the orgasm then that's all you'll get.
Sex is far more than just stimulation of the genitals (even with strangers there is a minimal emotional connection). You might be able to last a long time during masturbation but only last a few minutes or seconds when having sex.
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