[exodim]

To jak kolor oczu, mój drogi.
Z tym się człowiek rodzi.

Niekoniecznie.
...Overall, the environment shared by twins (including familial and societal attitudes) explained 0–17% of the choice of sexual partner, genetic factors 17–39% and the unique environment 61–66%. The individual's unique environment includes, for example, circumstances during pregnancy and childbirth, physical and psychological trauma (e.g., accidents, violence, and disease), peer groups (other than those shared with a twin), and sexual experiences. In men, genetic effects explained 0.34–0.39 of the variance, the shared environment 0.00, and the individual-specific environment 0.61–0.66 of the variance. Corresponding estimates among women were 0.18–0.19 for genetic factors, 0.16–0.17 for shared environmental, and 0.64–0.66 for unique environmental factors.