In males, this structure continues through the midline of the scrotum (scrotal raphe) and upwards through the posterior midline aspect of the penis (penile raphe). … It is the result of a fetal developmental phenomenon whereby the scrotum and penis close toward the midline and fuse.
Also to know is, why do I have a seam on my taint?
For males it occurs as the genetalia is forming externally and closing up to form the scrotum and penis (the line goes up the penis too) as apart from females where it is opening up somewhat to form the vaginal opening, and the seam then just occurs from there to the anus.
