That's probably true. In ancient pre-civilized times competition for dominance was and may still be tied to getting her preggers. Part of dong that is to overwhelm or remove the others semen. If you search for "Penis is a Competitive Beast" some interested reading may be found.
Found this excerpt in an article.
"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.
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