The ratio of length between a man's second and fourth fingers (2D:4D) is thought to be linked to the amount of testosterone he received in the womb. According to new research, it also shows something else: How attractive a man's face will be to women.

The research looked at the relationship between the 2D:4D ratio, how attractive women thought the face was, and other signs associated with attraction and testosterone production: body smell and voice.

Men with a lower 2D:4D ratio (shorter pointer and longer ring fingers) were thought by the subjects to be more attractive, have more "masculine" features, and have more symmetrical faces.

However, the men's smell and voices — both of which are linked to testosterone levels and attraction — didn't correlate with the ratio. Scientists say this implies that facial structure is influenced by the hormone during pregnancy, and voice and odor by testosterone levels later in life.

研究发现：男性食指和无名指的长度比例，关系到他在母亲子宫内获得的睾丸素多少。同时这也决定了该男子面貌吸引MM 的能力。

来自日内瓦大学研究人员得出的结果是：食指 > 无名指 食指 < 无名指，将更加阳刚、脸部更加对称，所以也更被MM 们所喜欢。

除此之外，其他于睾丸素有关的体毛特征暂与这个比例无关。

原来我们老听说这两根手指与GAY什么的有关。现在却是这个？！

研究人员收集到了49名男性自愿者的照片、录音、体味，然后分别叫了两组女性来打分，得出的结果。