When it comes to one-night stands, women prefer an upgraded model in their member of choice – compared to when they’re in a long-term relationship, anyway.

A new study has found that in cases of one-time sexual hookups, women are keen to try out a slightly larger penis than when they’ve got many romps with the same person ahead of them.

Researchers from the University of California and the University of New Mexico provided 75 women between the ages of 18 and 65 with 33 three-dimensional penis models of varying sizes – all made with rigid blue plastic “to minimize racial skin-color cues” – to choose from.

When the women were asked to select the model that best represented their preferred penis size in a long-term partner, the average response was 6.3 inches (16cm) in length and 4.8 inches (12.2cm) around.

But when the women were asked to choose their preferred penis size for a one-night stand, the average was slightly larger – 6.4 inches (16.3cm) long and 5.0 inches (12.7cm) around.

This study is the first to provide hard evidence that women prefer slightly larger penises than the global average. The average erect penis is 5.2 inches (13.1cm) long and 4.6 inches (11.7cm) around, according to a global analysis of 15,000 penises published last year.

The results of a questionnaire about the women’s past sexual experiences that accompanied the study revealed a range of first-hand penis encounters, from 2.5 inches in length to eight inches. Some of the women reported having ended a relationship in part because of a partner’s penis size, with seven percent of respondents saying it was because their partner’s penis was “too large” and 20 percent saying it was “too small.”

Best get measuring. 

h/t The Guardian.