Many people feel shy about buying the book in a bookstore.
But remember, the clerks in these stores sell so many books, they won't think twice about you buying it. If anything, they'll probably think you're buying it as a gift, or because you're romantic or a good lover. Believe me, they will never think you're a loser because you're buying a book on kissing. So don't be shy, my friend. He or she doesn't have this great book on kissing, and probably feels jealous of me for owning a copy.