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Human  Anatomy
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Let's take a look at the Girls First
Descriptions and explanations of
reproductive human anatomy and
physiology
This is  the internal female reproductive anatomy and physiology.
Inside the body where  you can't see it.
anatomy
These are the parts  you can see with a mirror. They
are the external female genitals.
Hood of the clitoris - a small piece of skin that
partially covers the clitoris
Clitoris - a small bump above or in front of the
opening to the vagina, actually somewhat like a small
penis. It swells or becomes erect when stimulated.
For many females this part needs some touching or
stimulation in order to have an orgasm.
Urethra - the tube that urine flows out of from the
bladder. The opening to the urethra is between the
clitoris and the opening to the vagina, This opening is
very small. A tampon could not be accidentally put
into it, a penis could not go into this opening.
Opening to the vagina - the vagina is inside the
body, it can not really be seen from the outside.
Labia or Lips - these are the lips that close around
the opening to the vagina.
Vulva -  this is the proper term for the external
female genitals
anatomy and physiology
More Human Anatomy
Now on to the boys
Scrotum - this is the name for the sac of skin that
the testicles are inside of. This sac contracts when
cold lifting the testicles closer to the body and
relaxes when warm to lower the testicles and keep
the inside temperature of the testicles about 2-3
degrees cooler than body temperature.
Testicles or testes -  these are the organs that
produce sperm and most of the testosterone
hormone in the male body.
Penis - This organ has a spongy tissue inside that
fills with blood to become erect. In this drawing it is
flaccid, that is not erect. An erect penis is larger
than when not erect and stick out or up.
Urethra  - This is a tube that goes from the bladder
through the penis and can take out either urine or
semen. A valve at the top of the urethra closes
during ejaculation and prevents urine from coming
out during ejaculation.
Vas Deferens -  this is a pair of tubes, one from
each testicle that wrap around the bladder and
connect to the urethra at the prostate gland. At
ejaculation sperm travel through these tubes.
Prostate gland - This gland makes most of the
semen (the fluid that comes out during ejaculation).
A slang term for semen is cum.
Seminal Vesicles - This gland also makes a fluid
that becomes part of the semen.
Cowpers gland - This gland makes a fluid known as pre-cum or
pre-ejaculate because it comes out before the cum or
ejaculation. It is a slippery clear fluid that can be seen or felt on
the end of the erect penis.
Bladder - this is where urine is stored.  
Epididymis - (not shown in drawing) this is a coiled tube that can
usually be felt at the back of each testicles. It is the beginning of
the Vas Deferens. Mature sperm may spend a couple of days in
the epididymis before being ejaculated
anatomy
Circumcision is an operation that removes
the foreskin, which is skin that covers the head
of the penis. Boys are generally circumcised
soon after birth, sometimes for religious
reasons. Some people believe that being
circumcised is healthier because the penis is
easier to clean. Other people believe that
leaving the foreskin on is better as the
operation is painful to the boy and the foreskin
protects the penis and therefore it remains
more sensitive to stimulation and sexual
pleasure. A male who is not circumcised needs
to pull the foreskin back to wash the head of
the penis and when putting a condom on the
foreskin needs to be pulled back first.
Changes of Pregnancy
Notice how the uterus stretches. It goes from a normal size of  4 or 5 inches in diameter to big
enough to hold a baby. The bladder and the intestines are squeezed to a much smaller than normal
size. Causing the pregnant woman to have to urinate frequently and perhaps have indigestion often.
The breast enlarge due to increased size of the milk producing glands.
Links to references
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website links
For more information on Human Anatomy and sexuality
education check out these books or website links.
human anatomy
The Sexual Parts - anatomy and physiology
human anatomy
Ovary - there are 2 of these, one on each side. At
puberty they start producing eggs, usually one a
month from one ovary. This is called ovulation, once
a girl has started ovulating she can get pregnant no
matter how young she is.
Fallopian tubes - there are 2 of these also, one for
each ovary. At ovulation the egg is released from an
ovary and travels down a fallopian tube. If the female
has had sexual intercourse sperm will swim into the
fallopian tubes and usually the egg gets fertilized by
a sperm in the tube.
Uterus -  The fertilized egg attaches to the lining of
the uterus and develops into a fetus in the uterus.
Endometrium - this is a lining of tissue that forms
each month on the walls of the uterus. If a female
becomes pregnant it thickens to help support the
pregnancy. If she doesn't get pregnant the lining is
shed each month. This called the menstrual flow.
Cervix - this part is between the vagina and the
uterus. It has a very small opening. Microscopic
sperm can easily pass through, but nothing much
bigger than that. The penis can't go through the
cervix. But at the time of giving birth hormones cause
the cervix to soften and be able to stretch to allow the
baby to be pushed through.
Vagina - The penis goes into the vagina during
sexual intercourse. The baby passes through the
vagina during the birth process.
Hymen (cherry) - At the opening of the vagina some
virgins (females who have never had sex) have a
membrane that partially closes the opening. Usually a
tampon can be inserted easily through the opening in
the hymen, but inserting a penis may tear the hymen
and cause bleeding and some pain. Not all virgins
have a hymen.
Not Pregnant