A man needs to rub his penis on the clitoris and
the pussy lips for at least 3 minutes. The couple will
notice the pussy should "puff up". This is literally a
"pussy erection".
Pure sexual pleasure is derived from the pussy lips
and attention should be paid to it. The penis has to
touch and rub against it continously for it to get
properly excited.
Without secret hole sex and the manipulatioon of the
labia minora, we are using (therefore human females
are deriving) about only 10 % (ten percent) pleasure from
the vagina / anal region.