Sex: How It Works Page #2

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youth and health.

NARRATOR:
One other physical

attribute also catches

the mens' eyes.

DR LINDA:
Since

we've become bipedal,

since we've kind of evolved from

walking on all fours to standing

on two legs, it's interesting

how sexual lures have adapted.

It's become much more

centered around the breasts,

y'know I guess the breasts are

the new buttocks.. the fact

that the breasts are right under

the face which is always what

we focus on, certainly helps.

Thank you for that...

we'll take a look at them.

I like that this is folded

up, that just worries me.

NARRATOR:
The initial tests show

some of the men are turned on

physiologically by a

number of the women.

We'll find out a bit later

if the women share those same

feelings towards the men.

But first let's check out how

sex works in the real world.

And in this...

We're going to follow

ladies' man - Rob,

and reveal the extraordinary

control sex hormones exert over

his mind and body in his

pursuit of a sexual encounter.

ROB:
Sex is for fun,

sex is for excitement.

I had numerous one night stands.

I'm 27.

I'm definitely not

ready to settle down.

I meet a lot of people,

see a lot of girls,

hang out with a lot of girls,

hook up with a lot of girls.

My friend, cos she knows I

don't carry condoms on me,

she got me this for my birthday,

and it came with three condoms

in it.

Needless to say, it only

lasted me one night,

but still I can just

put condoms in it,

and you know I'm

ready to go out.

NARRATOR:
Tonight

Rob's on a mission,

with one simple

goal - to have sex.

ROB:
I've had sex

with a lot of girls...

It's fun! Sex is fun!

NARRATOR:
To improve his

chances of finding a sexual

partner Rob's brought

his wingman, Brian.

BRIAN:
Step into my office...

ROB:
I set the tone!

DR LINDA:
Men have a higher

sex drive than women.

A women needs to invest in is

in one person who's going to be

a great parent helping

her raise that child.

From a male's point of view

it's going to be about having

the most chance to get those

genes to survive by having sex

with as many partners

as possible.

BRIAN:
You guys

seen any girls here,

is there any chicks around?

BRIAN:
We go out all the time,

almost every single night.

I don't have television or

internet at my apartment,

I would much rather go

enjoy the night life.

GUY:
If they're hot

they're taken...

BRIAN:
If they're hot

they're taken, huh?

So, yeah...

let's try and talk to

some of these taken women.

NARRATOR:
As with most men of

his age Rob thinks about sex

around 20 times a day,

twice as often as women do.

Rob lays down his best lines,

but it's his testosterone

that's really doing the talking.

And for single men like Rob

it's testosterone that dictates

sexual appetite and the

pursuit of a potential mate.

ROB:
Well you girls

have a very good night.

NARRATOR:
Just talking

to an attractive girl,

can trigger your testicles to

start pumping testosterone out.

In no time your

brain's awash with it,

the result - you increase

your efforts to get the girl.

ROB:
You gotta have sex!

You gotta be healthy.

I think sex is healthy!

NARRATOR:
Rob is right, women

who enjoy sex regularly live

longer than those that don't and

men who have sex 3 times a week

can cut their risk of heart

disease and stroke by half.

BRIAN:
You girls, hey girls..

ROB:
Excuse me ladies...

BRIAN:
You're in danger

of being empty handed.

Would you care for a drink?

Can I get you one?

GIRL:
Sure!

BRAIN:
What'll it be?

GIRL:
Jack and Coke...

BRIAN:
Jack and Coke...

GIRL:
Surprise me...

ROB:
You can't get a home run

if you don't take a swing.

So, you gotta, at

least give it a shot.

SHOT! Yeah!

I think sex is on

everyone's mind,

whether they like

to admit it or not.

NARRATOR:
One study found that

people below the age of 25

thought about sex up to

388 times in one day.

I think about sex

about every 11 seconds.

A girl's talking to

me and I might think about sex

three or four times in the

conversation that we're having

so it does add up yeah.

Man, I think

about sex all the time,

I think sex is very important

man, - highly sexed individual.

I love females - ha!

NARRATOR:
We'll catch up with

Rob's attempt to find a willing

sexual partner later.

In the sex lab, it's time to

discover if the way the women

think about sex is

different from the men.

DR LINDA:
So, this is the

eye tracking computer...

have a seat...

so very simply, it's going to

bring up a series of photographs

for you to enjoy, to look at.

We just want you to completely

relax and enjoy looking at

the pictures.

Hi, I'm Dr Linda,

what's your name?

FEMALE:
Oh, I'm Katharine.

NARRATOR:
Almost immediately

Katherine's pulse rate,

perspiration and pupil dilation

all jump when she looks at

pictures of Jack and Chris.

DR LINDA:
There was two guys

that Katharine really liked and

we saw it from the galvanic skin

response, it was a real spike.

We saw it in her

behavioural reaction.

We saw that she stood back,

she smiled right away,

but we also saw that she kept

that gaze a little bit longer.

FEMALE:
Yeah, I think men's

eyes are one of the first places

that I look... and their smile.

NARRATOR:
Although significant,

Katherine's biological responses

aren't as great as the results

seen when Chris looked

at Katherine's face.

Like men, female sex drive is

also powered by testosterone,

but at a fifteenth of

the level seen in males,

so the effect is

a lot more subtle.

FEMALE:
I've done a fair amount

of online dating as well,

so I know that people can

upgrade pictures and can look

great and then I meet them

and I'm like.. 'where was that

personality I saw in the photo!

DR LINDA:
What we're being

able to see with this,

is what women are tuned

to more in male face.

NARRATOR:
A pattern is forming.

It appears the more symmetrical

the man's face the stronger

the women's response.

DR LINDA:
The

reason for this is,

the assumption that if things

are symmetrical on the face

then it's indicative of

good health, of good genes.

So if you want to take

it to its basest level,

y'know we're always searching

out for a mate to pass on

our genes and symmetry is

one of those big indicators

that persons genes are healthy,

they're good and that'll mean

that if they mix up with my

genes they'll have a better

chance of survival.

NARRATOR:
The results provide

both conscious and biological

clues to who the subjects

find sexually attractive.

Can the scientific data predict

which couple will hook up?

And will everything change

when the volunteers meet

face to face?

There's no secret why humans

have evolved to have sex

to reproduce.

But nowadays most of us do

it for the intense pleasure

it provides through orgasm.

And while three-quarters of men

regularly orgasm during sex,

less than a third of women do.

WOMAN:
Very important

to orgasm during sex.

If not it's just like, you get

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