Perineal Raphe

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The perineal raphe extends from the anus, through the mid-line of the scrotum (scrotal raphe) and upwards through the posterior mid-line aspect of the penis (penile raphe). It is observed as a noticeable line.

It is the result of a fetal developmental phenomenon whereby the scrotum (the developmental equivalent of the labia in females) and penis close toward the midline and fuse. The resulting ridge of tissue is evident as the perineal raphe.

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A raphe is sometimes described as a suture line, and indeed when you look at the underside of the male genitals, it appears that two sides have been sewn together.  Involving the scrotum especially, it seems to extend all the way to the base of the glans corona where the frenulum appears.

Here are some more examples:

And finally note how the treasure trail here appears to extend the line up to the navel: