Male sex organs are penis and testicles--Size and form of penis when
at rest and during sexual excitement--Position of testicles--Why one
teste is larger--Pubic regions in men and women.

Female sex organs are vulva, vaginal passage, womb, and
ovaries--Length of vaginal passage compared with distended penis--Size
and formation of womb--Position of ovaries.


FUNCTION OF THE SEX ORGANS


Primary purpose of sex in the human race--Life is the result of union
of two forces--Birth the same in human beings as in other forms of
life--Process of conception in female--How female ovum is fertilized
by male--When puberty begins and ends in women.

Menstruation, its cause and meaning--When ovum may be
impregnated--Origin of sperm in man--Purpose of prostate gland--What
semen is--For birth of new life union of male and female sex organs
necessary--Glans penis in man and clitoris in woman are "exciting"
focal points--Climax of coitus.

Use of sexual organs to produce offspring same in mankind as in
animals--One way in which human beings differ from animals in sex
relations--Coitus possible in animals only in "rutting" season--In
human beings coitus enjoyable at any time--What this difference means
to happiness--The basis of real success in marriage--Married people