Great Posts! Lots of good info here, which is not always the case.
Just one thing I would like to clarify after many years of experience.
It is sometimes thought that one O trigger, or another, or another, is what triggers fem. ejac.
Actually, what is required for ejac is a hard, clenching, industrial strength orgasm. (Clenching is the main operative word here.) The G-spot O is the most dependable way to trigger such a volcano, but not the only way. It is more difficult by clit power, but not impossible.
Of course it is highly individual; each lady has her own program. So it is whatever spot, or spots, ring her bell the best. It is tricky and sometimes difficult to find the G, then learn how to use it (different from the other spots), so many ladies have developed enough sensitivity in one or more other spots to trigger ejac. But the G is waiting to blow your mind.