Sex: How It Works Page #4

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cells appear and they're gonna

kill all of those sperm

that are in the cervix.

So you've got one hour to get

from treacle a third of the way

up Everest otherwise

you're dead.

So what we're gonna do

today in our sperm race,

we'll look at how many get to

a certain distance and also how

far the furthest sperm can swim.

MALE PARTICIPANT: I'd be

absolutely gutted if I had low

sperm count.

NARRATOR:
Dr Kirkman-Brown asks

the volunteers to provide sperm

samples.

Wrapped inside a testicle are

tubes over 20 feet long that

produce over one hundred

million sperm every day.

Yet despite their huge numbers,

sperm only make up a tiny

fraction of the semen.

The rest is food for the

journey and chemical protection.

When a man ejaculates, semen

squirts out at around 28 mph

followed by an

intense rush of pleasure.

A reward for a job well done.

It's now time to count the

volunteers' sperm and calculate

how fast and far they swim.

JACKSON:
You've had a bit of

time away while we have done

the processing in the lab.

Obviously I have got a clipboard

with results on it and some data

for us to look at - are people

feeling a bit more nervous now?

BOYS Yeah, a little

bit nervous now.

BOY 1:
The problem is I can

only think about sperm now...

Sperm... sperm... sperm..

JACKSON:
First of all we just

have some data which is just

on the neat semen samples.

But we have got quote

a big range of results,

so we've gone from in the region

of 45/46 million sperm to one

of you having in the

region of 1 billion,

500 million sperm

in the ejaculate.

Tom is our hero with over a

billion sperm in his ejaculate

did you realize you were a

billionaire this morning?

TOM:
I always felt there was

something special about me

but it's nice to know there

are a lot of guys in there...

JACKSON:
Is it something you

will now tell your friends

about?

TOM:
I will now

yes, definitely!

JACKSON:
The final thing we

looked at was which sperm got

the furthest fastest...

We have Tyler as a

winner on this one.

BOY 1:
... unbelievable..

NARRATOR:
In one minute Tyler's

sperm covered a fifth of an inch

which may not sound much,

but it's equivalent to a human

swimming through syrup faster

than the best Olympic swimmer.

JACKSON:
What you'd have is that

first sperm would be getting

the best chance of

fertilize that egg.

So in this test that we have

run today and the results may be

totally different

on another day,

then Tyler would have

been the winner at that.

BOY 1:
Pretty like, over the

moon about it - cos it's always

been a um... at the back of my

head, like, would I be alright

if I wanted to have kids.

NARRATOR:
Despite the huge

numbers of sperm produced,

over 99.9% will be killed by the

time they reach their target:

the egg.

This obliteration is one of

the key reasons why men have

to produce so much sperm

in a single ejaculation.

Most people will have

more than one sexual partner

in their lives, so why

do so many of us end up

in a monogamous relationship?

Could this soon to be wed

couple help provide an answer?

TIFFANY:
.. being a virgin, there

are some things that I just

won't know until we have sex.

NARRATOR:
Ryan and Tiffany have

been together for 2 years but

have never had sex.

In 5 days, on their

wedding night,

that's all about to change.

RYAN:
Why we decided to abstain

from sex before marriage in our

relationship mainly stems back

from our religious background,

and our beliefs.

We really wanted to cultivate a

good friendship and we know that

when a lot of other things are

thrown into it like a sexual

or physical relationship

in the beginning,

you miss out on a lot of things.

TIFFANY:
And of course, you

know, with me being a virgin,

there are some things

that I just won't know until

we have sex.

RYAN:
Temptation is definitely

always there and especially

when you're sitting next

to your future wife.

I mean if were home alone

late, obviously I'm going to be

tempted so it's really avoiding

those situations completely,

which really helps a lot.

TIFFANY:
I'm not going to lie

and say that it's been easy

for us to not have sex.

RYAN:
It's a very rare thing,

and I'm not saying that to be

like to be like pat ourselves on

the back but it takes a lot of

discipline.

NARRATOR:
For his bachelor party

Ryan heads to the shooting range

Although Tiffany is a

virgin, Ryan is not.

RYAN:
It is Tiffany's first

time and it's not mine.

I did make some decisions in

the past to go ahead and have

relations with old

girlfriends and so, those...

what I thought was love, was not

love how it's supposed to be,

it was more physical,

selfish, what can I get out

of this relationship

type of thing and so...

good things are worth waiting

for and worth working towards

and it's gonna be a huge

blessing to experience this and

y'know I love Tiffany so I'm

gonna wait for her and protect

her and not be

physical ahead of time.

All of this building up,

it's gonna lead to a great

experience.

NARRATOR:
Couples who are

deeply in love produce more of

the pleasure hormone dopamine,

that can increase the enjoyment

of having sex.

Will Ryan and Tiffany's

first time be all the better

for waiting?

TIFFANY:
There is a little bit

of nervousness and I think a lot

of it is just because I've

never had sex before so.

It's just an unknown, not

knowing what to expect and not

knowing, y'know how it's gonna

feel and how I should react

and different things like that.

We plan on having sex for

the rest of our lives,

so we've got enough

time to learn!

NARRATOR:
Tiffany is a rarity,

as only 5% of people in the US

are virgins on

their wedding day.

With most people having

sex at the age of 17.

My first time

awkward, quick and fun.

I would say awkward

and eye-opening.

Well I lost mine in high school

in like tenth grade so like

sixteen.

Well, just the

age that I regret,

if I could turn back the hands

of time I would have waited

'til I was at that

right age you know.

I was 15, the girl

was seventeen,

we were drinking and you

know had some fun that night,

of course used protection,

I was a little nervous,

a little scared but you

know, eventually you know,

I got to use of it and

started working it out.

I was twenty when I lost my

virginity and I was embarrassed

'cos I was so old.

It was my first, like, real true

love and I decided it was a good

idea.

He turned into a real

douchebag who stole my bike,

my camera and my phone and he

slashed my car tyres so probably

could have picked him better!

NARRATOR:
In the sex lab the

tests to discover how our

sub-conscious responses control

our choice of sexual partner

continue.

It's time for the male and

female subjects to meet for

the first time, in a controlled

speed dating experiment.

Will their initial biological

reactions reflect how they

respond to each other in person?

How, How is it been so far?

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