Hannah, the spunky central character in the edgy new HBO series “Girls,” is a creative and endearingly naive 24-year-old bumbling fearlessly through post-college life. She works for years at an unpaid internship that never turns into a job and pretends to be far more sophisticated about sex than she actually is. She’s a loyal friend, but whatever you do, don’t ask her about human papillomavirus, or HPV. She’s clueless.

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