Final answer:
Western, biological definitions of homosexuality are influenced by heteronormativity and there is no consensus on the exact reasons for sexual orientation.
Step-by-step explanation:
Based on a cross-cultural survey, it is clear that western, biological definitions of what homosexuality is and is not are influenced by heteronormativity. Heteronormativity is the belief that heterosexuality is the most natural and normal form of sexuality.
In some cultures, people are allowed or even expected to engage in more than one form of sexuality without adopting any specific sexual identity. However, many societies still expect people to marry someone of the opposite sex and have children, even if they engage in same-sex practices in certain contexts.
While there is evidence suggesting a biological component to sexual orientation, there is no scientific consensus on the exact reasons why an individual holds a specific sexual orientation. Research has considered genetic, hormonal, developmental, social, and cultural influences, but no single factor has been identified as the sole determinant of sexual orientation.