When Spine matters in Sex

A very interesting article aobut Bean weevil sex organs and how it gives an evolutionary advantage to have bigger spines on the penile organ.
Read this interesting article by Ed Yong in ScienceBlog

Reference: Cosima Hotzy, Göran Arnqvist (2009). Sperm Competition Favors Harmful Males in Seed Beetles Current Biology DOI: 10.1016/j.cub.2009.01.045