Jill, Ann, and Kimberly go off to college with warnings from their parents about sex and the “Freshman 15” ringing in their ears. Months later, Jill has gained 15 pounds and Ann has become a sexual adventurer. Kimberly, on the other hand, has not only maintained her weight, she's been too busy studying in the library stacks to hook up.
What accounts for the differences?
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