Female Sexual Act
Stimulation
of the Female Sexual Act. As is true in the malesexual act, successful performance of the
female sexual act depends on both psychic stimulation and local sexual
stimulation. Thinking sexual thoughts can lead to female sexual desire, and
this aids greatly in the performance of the female sexual act. Such desire is
based largely on a woman’s background training as well as on her physi-ological
drive, although sexual desire does increase in proportion to the level of sex
hormones secreted. Desire also changes during the monthly sexual cycle,
reaching a peak near the time of ovulation, probably because of the high levels
of estrogen secretion during the preovulatory period.
Local sexual stimulation in women occurs in more or less the same
manner as in men because massage and other types of stimulation of the vulva,
vagina, and other perineal regions can create sexual sensations. The glans of
the clitoris is especially sensitive
for ini-tiating sexual sensations.
As in the male, the sexual sensory signals are trans-mitted to the
sacral segments of the spinal cord through the pudendal nerve and sacral
plexus. Once these signals have entered the spinal cord, they are transmitted
to the cerebrum. Also, local reflexes inte-grated in the sacral and lumbar
spinal cord are at least partly responsible for some of the reactions in the
female sexual organs.
Female
Erection and Lubrication. Located around theintroitus and extending into the clitoris is
erectile tissue almost identical to the erectile tissue of the penis. This
erectile tissue, like that of the penis, is controlled by the parasympathetic
nerves that pass through the nervi erigentes from the sacral plexus to the
external genitalia. In the early phases of sexual stimulation, parasympathetic
signals dilate the arteries of the erectile tissue, probably resulting from release
of acetylcholine, nitric oxide, and vasoactive intestinal polypeptide (VIP) at
the nerve endings. This allows rapid accumulation of blood in the erectile
tissue so that the introitus tightens around the penis; this aids the male
greatly in his attainment of sufficient sexual stimulation for ejaculation to
occur.
Parasympathetic signals also pass to the bilateral Bartholin’s
glands located beneath the labia minora and cause them to secrete mucus
immediately inside the introitus. This mucus is responsible for much of the
lubrication during sexual intercourse, although much is also provided by mucus
secreted by the vaginal epithelium and a small amount from the male urethral
glands. This lubrication is necessary during intercourse to establish a satisfactory
massaging sensation rather than an irritative sensation, which may be provoked
by a dry vagina. A massaging sensation constitutes the optimal stimulus for
evoking the appropriate reflexes that culminate in both the male and female
climaxes.
Female
Orgasm. When local sexual stimulation reachesmaximum intensity, and
especially when the local sensations are supported by appropriate psychic
conditioning signals from the cerebrum, reflexes are initiated that cause the
female orgasm, also called the female climax.
The female orgasm is analogous to emission and ejaculation in the male, and it
may help promote fertilization of the ovum. Indeed, the human female is known
to be somewhat more fertile when inseminated by normal sexual intercourse
rather than by artificial methods, thus indicating an important function of the
female orgasm. Possible reasons for this are as follows.
First, during the orgasm, the perineal muscles of the female
contract rhythmically, which results from spinal cord reflexes similar to those
that cause ejaculation in the male. It is possible that these reflexes increase
uterine and fallopian tube motility during the orgasm, thus helping to
transport the sperm upward through the uterus toward the ovum; information on
this subject is scanty, however. Also, the orgasm seems to cause dilation of
the cervical canal for up to 30 minutes, thus allowing easy transport of the
sperm.
Second, in many lower animals, copulation causes the posterior
pituitary gland to secrete oxytocin; this effect is probably mediated through
the brain amyg-daloid nuclei and then through the hypothalamus to the
pituitary. The oxytocin causes increased rhythmi-cal contractions of the
uterus, which have been postu-lated to cause increased transport of the sperm.
A few sperm have been shown to traverse the entire length of the fallopian tube
in the cow in about 5 minutes, a rate at least 10 times as fast as that which
the swim-ming motions of the sperm themselves could possibly achieve. Whether
this occurs in the human female is unknown.
In addition to the possible effects of the orgasm on fertilization,
the intense sexual sensations that develop during the orgasm also pass to the
cerebrum and cause intense muscle tension throughout the body. But after
culmination of the sexual act, this gives way during the succeeding minutes to
a sense of satisfaction charac-terized by relaxed peacefulness, an effect
called resolution.
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