Our results show that both testosterone and its corresponding psychological effects can fluctuate quickly and opportunistically. Scientists found that this hormonal and psychological shift made men more inclined to approach new potential partners. The research team measured hormone levels, as well as self-perceived attractiveness and confidence in approaching women, in 38 men in their twenties before and after competing in head-to-head battles on rowing machines.
Unbeknownst to participants, the competitions in the study were rigged to randomly declare the winner, regardless of who was the stronger rower. While previous studies have shown that winning can affect male hormones, it was not known whether this was down to the efforts it takes to win or the belief that one is victorious.
The latest study, led by biological anthropologists from the University of Cambridge and published today in the journal Human Nature , reveals that just being convinced you have won, or indeed lost, is enough to cause male hormonal fluctuations that can influence sexual behaviour. In this case a perceived change in social status, due to the men believing they have defeated a rival.
Namely, more sex with new and different partners. One reproductive approach is short-term, investing time and energy in attracting and pursuing many mates, and fighting off competition. Another approach is long-term, investing energy in raising offspring with a single mate.
Longman points out that in many animal populations, male social hierarchies correspond with reproductive success, and social status is determined by competition between males. The study used a simple proxy for social and sexual competition by pitting athletic young men against each other to see who was the most powerful rower.
