Sex in the morning or the evening?

June 26, 2007

Most research on sexual conflict ignores the fact that the fitness pay-offs of mating may change drastically over a short timescale, for example over a single day.

In fowl, the probability that an insemination results in fertilization is lowest around midday when oviposition occurs and highest in the evening, indicating that both males and females should maximize copulation efficiency by mating in the evening.

In research appearing in the July issue of The American Naturalist, researchers at the University of Oxford found that, as expected, male fowl are more sexually active in the evening. Female fowl on the other hand, change their daily pattern of sexual activity in response to the sex ratio of a population.

Females solicit sex in the evening in populations that are heavily female-biased, where sexual harassment by males is minimal, and females have more control of copulation. However, in male-biased populations, male sexual harassment of females is intense, especially in the evening. Here, females solicit sex early in the morning and avoid males in the evening. This behavioral plasticity in sexual behavior may enable females to reduce the cost of mating while maintaining some control over paternity.

Citation: Hanne Løvlie and Tommaso Pizzari, "Sex in the morning or in the evening" females adjust daily mating patterns to the intensity of sexual harassment" (open access) The American Naturalist (2007) 170:E1–E13, DOI: 10.1086/518180

Source: University of Chicago

Explore further: Early marriage and pregnancy risk for adolescent Syrian refugees

Related Stories

Who thinks only attractive women suffer sexual harassment?

November 8, 2016

A few weeks ago, Donald Trump described the women who accused him of sexual harassment as "unattractive and horrible." These statements are echoed in the results of research from the University of Granada. Scientists claim ...

Recommended for you

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.