Most Helpful Guy
Like her natural scent.
"Forget the pricey perfume. The natural scent of a woman at her most fertile may be enough to attract a mate. A new study shows that when men smell T-shirts worn by women while ovulating, it triggers a surge in the sex hormone testosterone."
Most Helpful Girl
Natural: lavender, lemongrass, cucumber melon, or coconut
Perfume: Versace yellow diamond, Juicy Viva la Juicy, Marc Jacobs Daisy, or Dolce and Gabbana Light Blue