Related Clues:

• What guarantees it's a boy? M-more choosy selection
• Gender-determining heredity unit
• What makes a man a man
• It's present only in male cells
• What a man requires for his sex
• What makes a boy more choosy, carelessly embracing male?
• Smoochy Romeo almost lost his parental inheritance
• Male distinctive feature
• What a man has that a woman doesn't
• Male characteristic
• Sex determinant in the human genome
• Sex-determining heredity unit
• Gene carrier that keeps people wanting more?