How much flubber is too much flubber?

I'm 5'8'' and weigh about 150 pounds (68kg) would you consider this fat or unattractive?

according to the BMI calculator I'm fine, and I know for a fact I am three times as fit and more healthy than most of my friends, I love excercise, I go hiking everyday...

Im just not a Waif, how much of a problem would this be to most guys? does a girl I have to be super svelt and skinny to be really attractive?

How much flubber is too much flubber?
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