You're using a condom aren't you? A lot of men can't cum with condoms, because it lowers the sensitivity so much. Maybe have sex, wash yourself and have her give you a bj afterwards. Or even ask her to get on the pill.
Another thing is you can control you own sensitivity. Don't masterbate so much, you generally hold yourself much harder than a woman's vagina would hold, after a few weeks your member will get more sensitive.
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"Smite the rocks with the rod of knowledge, and fountains of unstinted wealth will gush forth." - Ashbel Smith as he laid the first cornerstone of the University of Texas
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