Male and female reproductive systems  The female reproductive
system consists of two ovaries, two fallopian tubes, the uterus,
the cervix and the vagina. During ovulation, an egg is produced
by either the right or left ovary about 11 to 17 days before the
woman's next menstrual period, or approximately once a month.
The egg is released from the ovary into a fallopian tube and
swept by tiny hairlike cells (cilia) and muscle action into the
uterus.  See a picture of the female reproductive system.
Sperm develop in the testicle and finish maturing in the
epididymis. When the man comes (ejaculation), the sperm move out
of the epididymides through the vas deferens and into the tube
(urethra) that runs through the penis. Semen (the thick liquid
associated with sperm) is produced in the seminal vesicles and
prostate gland and added to the sperm before ejaculation from
the penis. Semen protects the sperm from the acid environment in
the vagina.  See a picture of the male reproductive system.  For
pregnancy to occur