Sex in the morning or the evening?

Jun 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: No walk in the park for S. Africa's embattled game rangers

add to favorites email to friend print save as pdf

Related Stories

Charging electric cars efficiently inductive

4 minutes ago

We already charge our toothbrushes and cellphones using contactless technology. Researchers have developed a particularly efficient and cost-effective method that means electric cars could soon follow suit.

Image: Hubble serves a slice of stars

9 minutes ago

The thin, glowing streak slicing across this image cuts a lonely figure, with only a few foreground stars and galaxies in the distant background for company.

Recommended for you

Reptile Database surpasses 10,000 reptile species

9 hours ago

More than 10,000 reptile species have been recorded into the Reptile Database, a web-based catalogue of all living reptile species and classification, making the reptile species among the most diverse vertebrate ...

User comments : 0