I've wondered if its just a statistical thing. Let's throw some hypothetical numbers out there:
Incident rate of "jacked" guys: 1%
Incident rate of "successful" guys: 3%
If the two factors were independent of each other, wouldn't that make the rate of jacked and successful guys 1% x 3% = 0.03% ? That's like three per ten thousand guys from the regular population.
I've thought about this for females too. If you think about all combining all the desirable traits (i.e. pretty, intelligent, nice physique, kind, successful sexually adept) it's got to be a super-small frequency like one per ten thousand or so.