“Human Sociobiology: Pair-Bonding and Resource Predictability (effects of Social Class and Race)”, 1977 (; backlinks; similar):
Social class and racial differences in human pair-bonding and heterosexual behavior patterns are considered in an evolutionary perspective. The expected unpredictability of one’s future income stream should be an important parameter influencing these variables, according to theoretical considerations.
The literature is reviewed relevant to the prediction that those facing more predictable income streams should have a stronger marital pair bond and premarital sexual activities more likely to lead to a strong pair bond, all other things being equal.
It is shown that those with high education or high occupational status do have more predictable income streams, and that their pair-bonding activities exhibit the predicted consequences of that fact. A much smaller number of studies comparing different races’ sexual patterns are also consistent with the theory. In the extremely few cases that permit it, it is found that a correlate of income predictability is more important in determining the dependent variables than either race or class, as expected.
Alternative explanations of the data are briefly examined and found wanting, especially with respect to explaining the patterns of individuals whose parental class differs from their own. Further research is suggested.