How to get good grades

Reading, Writing, and S*x: The Effect of Losing Virginity on Academic Performance:

Controlling for a wide set of individual- and family-level observables
available in the National Longitudinal Study of Adolescent Health,
ordinary least squares (OLS) estimates show that sexually active
adolescents have grade point averages that are approximately 0.2 points
lower than virgins.  However, when information on the timing of
intercourse decisions is exploited and individual fixed effects are
included, the negative effect of sexual intercourse disappears for
females, but persists for males.  Taken together, the results of this
study suggest that while there may be adverse academic spillovers from
engaging in intercourse for some adolescents, previous studies’ estimates
are overstated due to unmeasured heterogeneity.

That is from economist Joseph J. Sabia.  Robin Hanson, my source, wrote:

My interpretation:  Teen boys who want sex out of teen girls have to
spend a lot of time in sports, fights, clubs, signaling their
attractiveness.  Teen girls who want sex just have to say
"yes", and the sex itself takes little time, especially given
that teenage boys are the partners. 


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