1. Splitting the lark-the origins of sex.
2. Pinpointing the difference-comparing male and female brains.
3. Heart to heart-sex differences in emotion.
4. Perfect partners-the monogamy puzzle.
5. The second date-inquiries into sexual orientation.
6. The big T-defining testosterone.
7. The cycle game-biology and estrogens.
8. Counterstrikes-love, lust and rape.
9. Once divided-power and gender biology.
