wham, bam...

Dreaming of a long night with your dream mate between the sheets?

Make that seven to 13 minutes.

That's how long the best sex should last, according to a recent study from the international Journal of Sexual Medicine. Get the full story here. Even three-minute sex is "adequate," the study adds.

Americans generally expect sex to last 15-20 minutes, earlier studies found.

Looks like some lucky women just earned about 10 extra minutes' worth of cuddling time!