When it comes to sex, length (of time) matters - Sexual health- msnbc.com
I read this a little while ago--apparently 7 minutes is right around average.
But yeah. Not lasting for hours at a time is, at least this woman, not that big a deal if the gentleman makes sure I am satisfied. I personally hate the idea of desensitizing--I think it's often under-appreciated how much women enough pleasing their partners as well. Of course getting a man off is very different...but to me, it's a great thrill knowing I'm pleasing my lover. Just a thought.
Make sure she gets hers through whatever means, and your lady fair shall not leave your bed unsatisfied.