"Probe Feel" does not need obscure or sexual references.
I could explain why the sexual references are totally invalid based on my experiences, but will not.
It is simply "like butter"--no more, no less.
Everyone has butter available and it is reasonably consistent.
Each cook will need to "calibrate the feel", but that only takes a few attempts.
If you get the "feel" and it turns out tough later, simply adjust your "feel" the next time.
This is not Rocket Science and is not Hustler material.
Simple--
TIM