This is like the jackin' thing... but let the girl go down on you, then you go down on her while you work up your mojo... sometimes she might need to give you some help once she comes, but you'll be ready to go and you'll be at least a little better.
Plus once she has an orgasm, you can have sex with her for 5 mins and she'll still come off satisfied.
All I'm sayin' is... Go down on her untill she comes (assuming you can pull that off) and then go for it... If you blast in 4 mins, then repeat the process.
I've never had a problem with shit like that, but it changes from girl to girl and relationship to relationship. What you need to do, is figure out how to satisfy her, even if you can't hold out for more than 5 mins. I mean, hopefully by the time your 5 mins is over, she's happy you're done and she can get back to smokin a blunt or bakin' some cookies or just get back on the street for the next guy.