Men freaking out after finding out what 'stitch' on bottom of scrotum really is

If you are one of the many people with a set of testicles in your pants, then chances are you may have noticed a strange line running down the middle of your scrotum.

But before you start worrying, this is perfectly normal - so don't panic.

It's one of those strange quirks of human anatomy which has had some very strange explanations in the past because if history teaches us anything, it's that we've always been poking around our nether regions wondering what's going on.

And people have come up with some strange notions as to the origin of the 'scrotal line' - presumably because that's what people did before smartphones.

One theory about why this scar is that it's a remnant of the human penis bone. No, really.

A slightly more, let's say 'old-fashioned' theory is that this weird scar is tied into the biblical story of Adam and Eve.

The story you've probably heard is that Eve was made from Adam's rib - but the odd theory would suggest that actually, it was not Adam's rib but his penis bone.

So when God stitched Adam back up, he left that strange scar on his scrotum which every scrotum-owner would carry thenceforth - though this theory is hotly debated.

So you probably won't be shocked to discover that this is not, in fact, the reason for the scar-like mark, as it instead starts when we are developing in the womb.

There's actually a simple reason for that mark on the scrotum. (lvcandy / Getty)

Every foetus starts out in the womb with a thing called the 'labioscrotal swellings', which is where the privates are going to develop.

And male and female embryos are pretty much identical until around nine weeks into the pregnancy when they start developing their genitals.

If the foetus goes on to develop a vagina, then these will grow into the outer labia.

However, if it goes on to grow a penis then these will fuse together to form the scrotum, therefore creating a line which is medically known as 'Scrotal Raphe' - just in case you wanted to refer to it properly.

It's all dependent on whether you have a Y chromosome or not (SCIENCE PHOTO LIBRARY / Getty)

Many blokes were relieved to find out they weren't actually 'two guys sewn into one', and someone else joked that it meant 'the curtains are closed'.

Meanwhile, some were thrilled to find out that it wasn't a scar from a forgotten injury.

And while we are still on the topic of b*****ks, the reason the testes hang outside the body and aren't inside like ovaries is because the best temperature for sperm is a few degrees lower than human body temperature.

Hanging them outside helps keep the swimmers fighting fit for when the time comes - or indeed the owner does.

The more you know.