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Women looking for a one night stand prefer different sized penises to those looking for a long term relationship, researchers have revealed.

They found that for one night stand, a large girth was more desirable.

However, the team also discovered women were poor at estimating sizes - almost always overestimating them.

Women looking for a one night stand prefer thicker penises to those looking for a long term relationship, researchers have revealed.

Shannon Leung, an undergraduate in biology at the University of California, Los Angeles, presented the findings last month at the meeting of the Association for Psychological Science in San Francisco.

In the study, 41 women viewed and handled penises made on a 3D printer.

The models were blue, and ranged in size from 4 inches long and 2.5 inches in circumference to 8.5 inches long and 7 inches in circumference.

The women were asked to pick which of the 33 models they would prefer for a one-time partner, and which they would prefer for a long-term partner,

'They preferred larger-girth (but not longer-length) models for one-time partners than for longer-term partners, the researchers wrote.

'Women's sexual selection may help explain why human penises are unusually thick compared to other primates.'

Women in a long term relationship preferred a thinner penis, the team found - but the same length

The women also preferred the same length - 6.5inches, regardless of the type of relationship.

A second study gave women one of the penis models for 30 seconds.

They were then asked to pick that same model from a bin of 33 models 10 minutes later.

Women tended to overestimate the size of the penis they had previously examined, the study found.

'For men who are considering surgery to increase their phallus sizes, maybe they do not have to after all, if women tend to overestimate' the size of a penis they've seen, Leung told Livescience.