Is the linea nigra reliable?

Patient's question:

There is medical evidence that on the inner side of a boy's arm joint, about an inch towards the palm, there is a line similar to a cut or fingernail scratch mark. It is usually very noticeable, which is what is known as the "virgin line." If there has been sexual activity, this line disappears, just like the "virgin mark" on a woman. It is very scientific, and the identification method is also very simple. Is this message certain?~ But why do some people still have it on their arms after doing it a few times?

Doctor's answer:

The so-called "virgin line" is also superstition. Everyone's fingerprints are different, and the wrinkles on a person's body are also unique. As people age, the number of wrinkles on their body gradually increases. If there really were a virgin line, it would mean that the older a person gets, the more visible this line would become. However, as men age, the number of virgins among them decreases. Clearly, this is also nonsense! There is absolutely no scientific basis for this.

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