The orgasmic platform is the swelling or thickening of the tissues
of the outer third of the vagina, as you can see on the drawing.

·
This happens during the plateau
phase of sexual excitement.
·
The inner part of the vagina
expands, while the vaginal entrance narrows by 30% or more.
·
Because the size of the opening
becomes smaller there is a gripping of the penis.
This is one of the reasons penis size is not that important to a woman’s physical
stimulation during intercourse:
because the entrance becomes smaller there is often a tight fit.