Why Do Men Have Nipples?

You know how it is . . . you''re at a party, you''ve had a drink or two and then someone introduces you to a friend. He''s a doctor. And it seems like the perfect time to ask all those strange questions you''ve always wondered about, but never had the courage to ask:

Can poppy seeds make you test positive for heroin?
What are goosebumps?
Why does asparagus make your wee smell?
Why do old people get ha...