ABSTRACT
This chapter assesses the genetic portfolios of five classes of persons who find themselves in circumstances that constrain or skew optimal genetic investment in some way. Intermarriage between ethnic groups has been accelerating over recent centuries with the advent of mass transportation and with international economic and political integration. What are genetic interests of people in mixed marriages and those of their offspring? Intermarriage lowers but does not eliminate the fitness payoff of investing in familial or ethnic genetic interests. Individuals who remain childless are an interesting case because there are fewer close kin in whom they can invest. This makes the extended family and ethny attractive investments. Societies can be expected to show greatest generosity to foreigners when their benevolent feelings are not compromised by ethnocentric reactions to growing numbers of foreigners within their territory. Naturally many homosexuals seek reforms to custom and law that protect their proximate interests, especially freedom from persecution for the expression of their sexuality.
