Since there is a tradeoff between prolonged formal education and early
reproduction, education can be construed as a long-term reproductive
tactic. This reproductive strategies approach was tested by looking at
relationships between sociosexuality (SOI) and parental investment (p
arental income, number of siblings, parental divorce, number of step s
iblings, birth intervals, birth order closeness to parents) and GPA of
139 White students at a private college. Parental investment was redu
ced to three factors (Family Composition, Family Security, and Marital
Instability), the last of which was negatively correlated with GPA an
d positively correlated with SOI. SOI was a much stronger (negative) p
redictor of GPA in women, but not men, than ACT was. Results support t
he reproductive strategies approach and imply that prediction of acade
mic difficulty (and gender differences therein) must confront reproduc
tive issues.