[mkl]

The correlation is quite small, but interesting nevertheless. I tried looking for replication studies, but couldn't find any.

Here is the publication in question: http://www.udel.edu/educ/gottfredson/reprints/2009semen.pdf

Here is an addendum trying to explain why it might be the case: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2775227/