Gallup G. The human penis as a semen displacement device. Evolution and Human Behavior. 2003; 24(4): 277–289.
115
Baker R., Bellis M. “Kamikaze” sperm in mammals?
116
Moore H., Martin M., Birkhead T. No evidence for killer sperm or other selective interactions between human spermatozoa in ejaculates of different males in vitro. Proceedings of the Royal Society B: Biological Sciences.1999; 266: 2343–2350.
