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Males of some species have also been found to differentially allocate seminal fluid proteins (reviewed in Perry et al. 2003 delBarco-Trillo and Ferkin 2006 Thomas and Simmons 2007 Lüpold et al.
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2002 Kelly and Jennions 2011 also see Evans et al. Differential allocation of sperm based on exposure to competitor males and on female qualities occurs in a wide range of species (reviewed in Wedell et al. In the case of ejaculate composition, selection may favor differential allocation of sperm and other ejaculate components depending on intrinsic (e.g., the male’s own condition) or extrinsic factors (e.g., presence of competitors or condition of the females Perry et al. Thus, our results suggest that human males ejaculate more quickly and invest more in ejaculates with novel females.Ĭompetition between males for fertilization of a female’s eggs can result in selection on a variety of phenotypic traits, including morphology, behavior, physiology, and ejaculate composition.
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Time to ejaculation also decreased significantly upon exposure to a novel female. However, ejaculate volume and total motile sperm count significantly increased when males were exposed to a novel female. When males were exposed successively to the same female six times, we saw no change in ejaculate parameters between the first and sixth exposures to the same female. We analyzed ejaculates produced through masturbation with stimulation from sexually explicit films. We tested for effects of stimulus habituation and novelty on ejaculated semen parameters in humans. In some species, males reduce their investment in sperm quantity or quality upon repeated matings with the same female and increase such investment when mated to a novel female. Males in many species differentially allocate sperm and seminal fluid depending on certain social variables, including perceived sperm competition and female reproductive status.