Maybe it's just the girl I'm with but 5-6 times in a day is pretty standard. But if we're talking in a row, I suppose 3 can be kind of rough.
My girl has a totally rockin' body and immaculate breasteses though, that gives me incentive. I luck sacced her, but don't tell her that This is, in fact, a brag post. *swoon*
Probably the best way is to tease each other for a few hours beforehand in a club/bar or whatever. Then you get really into the girl and you want to fuck her brains out.
Also don't drink caffeine/alcohol, makes your jizz taste horrible apparently. Eat lots of fruits and vegetables beforehand.