PSC Brown Bags will return in the fall
Epelman, M.A., S. Pollock, B. Netter, and Bobbi Low. 2005. "Anisogamy, expenditure of reproductive effort, and the optimality of having two sexes." Operations Research, 53(3): 560-567.
No good formal arguments exist for a central question in biology: Why, in species that have sexual reproduction, are there usually only "males" and "females"? We present a nonlinear optimization model that supports the conclusion that having only two sexes maximizes long-run viability.