Size doesn't matter? Well, maybe it does, at least a little. A new study finds that when it comes to a fling, women prefer a bigger penis. More specifically, researchers found that in a one-time sexual partner, women on average prefer a penis 6.4 inches long and 5 inches in circumference, the Guardian reports. Compare that to the penis they prefer, on average, in a long-term partner: 6.3 inches in length and 4.8 inches in circumference. The average penis, when erect, is 5.2 inches long and 4.6 inches around.
The researchers, from the University of California and the University of New Mexico, asked 75 women ages 18 to 65 their preferences based on 33 three-dimensional penis models made of hard blue plastic (they didn't want the women to be influenced by "racial skin-color cues"). This is significant, since previous studies utilized two-dimensional, flaccid penises to establish women's preferences. The study also found that 7% of women had ended a relationship because their partner's penis was too big, while 20% had ended a romance over it being not big enough. (Read more sexuality stories.)