Do u kno y i have a brown line from my navel to my reproductive organ and what is it called? i am a male!?

I have seen that woman get it and ive searched for it on the net but cannot find a clear answer. I am a male. Ive heard its been called happy trail, nature trail. I would like to know why i have it or what it represents. Was i abducted by aliens?..lol...or what?
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