Was Jennifer Aniston's character Beth in the film He's Just Not That Into You attracted to her boyfriend Neil, played by Ben Affleck, because of his big pupils?

Researchers have discovered what women are really thinking when they look into a man’s eyes – and it is all about the size of their...pupils.

Women become attracted to men with large pupils just as they are approaching their most fertile time of the month, the study at Edinburgh University found.

Scientists suggest that it may be because it indicates that the man is sexually interested in them and available for mating. Pupil size made no significant difference for the rest of the menstrual cycle.

In the research, published in respected journal Personality And Individual Differences, photographs of six equally attractive men were presented to a judging panel of ten women.

But for each man, three versions of the photo were produced, with the pupils large, medium or small.

The pictures of the men were then mixed up and put into pairs for the women to rate.

Participants recorded their age, whether they were using hormonal birth control, the date of onset of their menstrual period preceding the test and the length of their menstrual cycle.

The results revealed that attraction to large pupils shot up four days before day 13 of the menstrual cycle, the usual monthly peak in fertility.

在影片《其实他没那么喜欢你》中，Jennifer Aniston饰演的Beth喜欢上她的男朋友Neil，是不是因为其扮演者Ben Affleck也有一双大眼睛？

研究人员已发现女人在看男人的眼睛时他们到底在想什么——那主要和他们瞳孔的大小有关。

爱丁堡大学研究发现，女人开始被大瞳孔男人所吸引就在一个月中她们的卵子最活跃的那段时间。

科学家提出，那可能是由于在她们眼里，它暗示着男人更性感更易交配。在月经周期其余的日子里，瞳孔大小显示不出这种明显差异。

在发表于权威杂志《个性与个体差异》上的该项研究中，6个具有同等吸引力的男人的照片摆在由10个女人组成的评判团前。

但是每个男人照片都被改成3组，一组瞳孔大的，一组瞳孔中等大小的，一组瞳孔小的。

然后这些男人的照片被混合在一起，让每组2个女人来评价。

这些参与者的年龄均记录在案，以及是否使用激素节育，测试前月经期初始日子和月经周期的长短。

研究结果显示，大瞳孔的吸引力在通常每月的卵子活跃期也就是月经周期前13天开始，有4天会表现得非常强烈。