Name: なぜセクシーはセクシーなのか (Why Sexy Is Sexy)
Uploaded: 2021-01-14T05:59:17.000Z
Duration: 3 min 29 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Anyone, or anything, that reproduces sexually

We spend a lot of time thinking about mate choice

because passing on your genes early and often is how you win at being alive.

it's the most important thing you will ever do, if you do it.

it's also very complicated, you may have noticed.

Our general understanding of it comes from Charles Darwin

who proposed that some individuals get more action than others

One gender of a species consistently prefers mates with specific traits

so individuals with those traits pass their genes on more often

and spread their genes, and the traits, throughout a population.

Old Charlie was certainly on to something.

Some would consider this overkill, but to the ladies,

a big frothy rack of feathers shows that a dude is healthy

So, as a result of sexual selection, male peacocks

have evolved to look like 1970s Las Vegas showgirls.

Humans, like peacocks, have evolved to like some traits more than others,

and these preferences date back to a time when those traits

gave an individual huge survival advantages.

So in most cases, beauty is actually a language

that conveys information about health and fertility.

But if you're thinking that it's all about boobs and big muscles,

You know what really turns us on? Bilateral symmetry.

Humans are attracted to people whose bodies and

Symmetrical imbalance can mean someone was exposed to

some kind of stressor during early development

that they weren't tough enough to deal with.

Similarly, a low waist-to-hip ratio drives both

Where fat is deposited on a body is determined by

sex hormones: testosterone in men and estrogen in women.

Women who produce the ideal amount of estrogen

generally have waists that are about 70% the width of their hips.

People with this ideal ratio are often less susceptible

to cardiovascular disorders, cancer, diabetes, and

women in this range also have less difficulty conceiving and giving birth.

why will a nice, symmetical guy with an ideal waist-hip ratio

make you feel kind of meh, but he's got your friend

Everybody gives off subtle chemical signals called pheromones

which gives potential mates a clue to our genetic profiles.

Studies have shown that men and women are generally

attracted to pheromones of individuals that are

genetically similar to themselves, with one major exception.

They prefer mates with a different kind of

Major Histocompatibility Complex, or MHC.

The combo of two variations of the MHC gene

helps a couple's offspring fight off disease better

But even after you account for pheromones

and symmetry and ratios, it's complicated.

And people don't make rational decisions, so really

don't bother with those hair plugs or that boob job.

Thanks for watching this episode of SciShow.

In the comments, tell us what makes you attracted

Also if you have any questions or ideas or comments,

you can leave those down in the comments or get in touch with us

And if you want to continue getting smarter with us all the time,

you can go to youtube.com/scishow and subscribe.