Rest easy. According to Dr. Sirot, that’s complete and utter BS.
“No, I hate that,” Sirot said. “I have to use my professor speak here, but the only thing we speculated about that is that our results are consistent with the hypothesis that in our evolutionary past men had opportunity for extra-pair populations. It doesn’t mean men are selected to mate with new females, and mate with lots of females, that’s not at all what our results mean.”
It does mean that a one-night-stand could be more favorable for conceiving
Tinder loyalists, beware. Your night games could be considered a fertile playground.
“We simulated a one-night-stand more or less, so it does suggest that maybe men would transfer a different ejaculate in a one-night-stand than in a long-term relationship,” Sirot said. “But the conception also depends on how the female's body is responding, whether she is receptive to the sperm, where she is in her ovulation cycle -- there are so many other factors that affect conceiving.”