Can you really know people's sexual orientation by reading their palms?

In fact, the length ratio of index finger to ring finger (2D∶4D) is a research hotspot in recent years. As early as 1930, some researchers found that people of different sexes have different 2D∶4D values. Generally speaking, a woman's index finger is usually longer than her ring finger. 1998, British professor J.T. Manning found that the value of 2D∶4D can be used as a reference for indirectly measuring the level of sex hormones before birth. At present, the scientific community has basically recognized that this ratio is related to the androgen level in the surrounding environment before birth. Moreover, the 2D∶4D value of the right hand can better reflect this point than the 2D∶4D value of the left hand. As for whether this ratio is related to the brain structure, personality and even sexual orientation after birth, there are still many debates in academic circles. Many associations have different opinions and can only say "no conclusion".

Many papers on the relationship between 2D∶4D value and sexual orientation have been published. 20 10 A paper published in Behavioral Neurology by Teresa Grimbos and others summarized several independent research results related to 2D∶4D values and sexual orientation published in previous years. All the collected studies have been strictly screened, and studies that allow subjects to measure the 2D∶4D value of their right hands by themselves are not selected. The reason is that most of the subjects are right-handed, and measuring the finger length of the right hand by themselves is easy to produce large data errors. The final statistics come from 34 independent samples. * * Including 16 18 heterosexual men, 1693 heterosexual women, 1503 homosexual men,10/4 homosexual women. This paper can be regarded as a summary of a large number of samples in recent years. The statistical results of these data show that the 2D∶4D value of heterosexual women's hands is higher than that of homosexual women, that is to say, the index finger is relatively long. However, there is no significant difference in 2D∶4D between gay men and heterosexuals.

However, the research collected by Grambos mainly comes from Europe and North America, and the racial data of many people involved in the research are no longer available. There are also many studies showing that race may affect the 2D∶4D value. Therefore, it is unknown whether his research results are applicable to Asians. In addition, there are many methods to measure the finger length, some studies directly measure the finger length, and some studies measure the finger length after taking photos, which may introduce errors to the experimental results. Finally, statistical correlation and its application in real life are two different things. It is absolutely impossible to know a person's sexual orientation by reading his palm.

Conclusion: The rumor is shattered. The length difference between the index finger and the ring finger may indeed reflect some characteristics of a person's birth environment. But there is no reliable evidence to prove that it has anything to do with people's sexual orientation. Relevant statistics also do not support the viewpoint in the rumor.