Income and reproductive success in the US

A paper looking at sex differences in the effect of income on reproductive success, with implications for understanding the demographic transition:

Sex, status, and reproductive success in the contemporary United States
- Rosemary Hopcroft

Evolution and Human Behavior, March 2006, 27:104-120

Abstract: This paper reexamines the relationship between status and reproductive success (at the ultimate and proximate levels) using data on sex frequency and number of biological children from representative samples of the U.S. population. An ordered probit analysis of data from the 1989–2000 General Social Survey (GSS) shows that high-income men report greater frequency of sex than all others do. An OLS regression of data from the 1994 GSS shows that high-income men have more biological children than do low-income men and high-income women. Furthermore, more educated men have more biological children than do more educated women. Results also show that intelligence decreases the number of offspring and frequency of sex for both men and women.