And yet, that isn't so for everyone, or for everyone all the time.
Once more, with feeling: MOST of orgasm is about AROUSAL. MOST of arousal is emotional and psychological. And some people can reach orgasm without genital stimulus at all!
For the aspects which are physical, while for one person, some type of urtheral sponge, or g-spot, penetration may help a person achieve orgasm, for another that may do nothing and kissing or massaging their neck might! And for the person for whom g-spot stimulus "works," it might do so on one day, or with one type of stimulus or one partner, and not the very next.
This is a BIG reason why specific technique information isn't helpful: it's relatively individual, and it's very anecdotal. And what works for you or I are personally is going to vary from partner to partner, situation to situation, year to year and even day to day.
(Let's also please remember that the whole world isn't heterosexual, while we're at it.)