One must never, as John Cleese put it, stampede the clitoris.
All men know this during their dispassionate, reflective moments, but when sexual lust rears its insistent head, some men become stricken with amnesia and think they can just hop on and go at it.
They can't. It takes us, I don't know, approximately 11.7 minutes to become fully aroused.
We like to be fondled, we like to be kissed, we like to be told how gorgeous we are, we crave more than a bare minimum of caresses.
Otherwise, we become cold and hard, which is not the way you want us!