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Sex survey
They also say they have evidence, from surveys of students, to indicate that sex tends to be more energetic if the women is suspected of cheating, or if the couple has been apart - suggesting a sub-conscious desire on the part of the man to rid his partner of any trace of another's semen.
Lead researcher Professor Gordon Gallup told BBC News Online: "We theorize that as a consequence of competition for paternity, human males evolved uniquely configured penises that function to displace semen from the female vagina left by other males.
"Thus, the human penis may enable males to substitute their semen for the semen of their competitors.
"Not only did we obtain data derived from artificial genital models that were consistent with this hypothesis, but we also found that under conditions that raise the threat of female infidelity, college students reported changes in sexual behavior that would serve to purge the vagina of foreign semen prior to ejaculation."
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