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6. Gallup Jr, G.G. and R.L. Burch, Semen displacement as a sperm competition strategy in humans.Evolutionary Psychology, 2004. 2(1): p. 147470490400200105.

7. Ramm, S.A., Sexual selection and genital evolution in mammals: a phylogenetic analysis of baculum length.The American Naturalist, 2007. 169(3): p. 360-369.

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9. Coker, C.R., et al., Intromittent organ morphology and testis size in relation to mating system in waterfowl.The Auk, 2002: p. 403-413.

10. Gasparini, C., A. Pilastro, and J.P. Evans, Male genital morphology and its influence on female mating preferences and paternity success in guppies.PLoS One, 2011. 6(7): p. e22329.

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