This is a medical study the entire family can enjoy, one way and another:
“Effect of maternal coffee, smoking and drinking behavior on adult son’s semen quality,” P.M. Cirillo, B.A. Cohn, N.Y. Krigbaum, M. Lee, C. Brazil, and Pam Factor-Litvak [pictured here], Journal of Developmental Origins of Health and Disease, vol. 2, no. 6, 2011, pp. 375-386.
The authors are at the Public Health Institute, Berkeley, CA, the University of California, Davis, and Columbia University, New York.