zDuring
the female plateau phase, the following changes occur if effective erotic
stimuli are present:
z
z1.
The wall of the outer
one-third of the vagina
becomes greatly engorged with blood so that the vaginal cavity is
reduced from that in the excitement phase.
z
zAlso,
the labia minora become more engorged with blood and thus become redder and
larger. These changes in the outer third of the vagina and the labia minora
are called the orgasmic platform because they indicate that orgasm
is imminent.