A new study purports to use evolutionary psychology to explain why men fall asleep after sex, and what it actually means. The study is being widely reported as proving that men only fall asleep after sex to avoid giving affection or commitment to their female partners. 
Researchers Daniel Kruger of the University of Michigan and Susan 
Hughes of Albright College just published this new study, in which they 
examine what they call the Post-Coital Time Interval (PCTI). Their 
study, which appears in the Journal of Social, Evolutionary, and Cultural Psychology,
 asked 456 participants - 295 female and 161 male undergraduates from a 
pair of Midwestern universities - to complete an anonymous online survey
 where they detailed what they wanted from the PCTI experience, as well 
as which partner was more likely to fall asleep first after sex.
The basic findings were these: whatever the stereotypes might be, men
 were no more likely to fall asleep before women after sex, according to
 the respondents. However, the researchers found that men were more 
likely to stay awake longer if sex hadn't taken place. Also, those whose
 partners fell asleep shortly after sex were the ones most likely to 
express a desire for cuddling and talk during the PCTI.
The whole paper is well worth reading, as it's a perfect encapsulation 
of why we're often so dubious about evolutionary psychology around here.
 The basic experiment has provided some interesting data, and the paper 
cites tons of previous sources that help build up a picture of the 
larger psychological mechanisms that might be at work here. 
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Kruger, D.J., & Hughes, S.M. (2011). Tendencies to fall asleep first after sex are associated with greater partner desires for bonding and affection. Journal of Social, Evolutionary, and Cultural Psychology 5(4): 239-247.   
 
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