You have it all correct in your post..
A woman’s orgasm is from her g-spot /clitoris and cant orgasm from being fucked in the ass unless like you say.. presses against her g-spot
A man is done by things being done to his prostate.. from being fucked to using toys to using his finger to stimulate the prostate
And if any one says they made a woman orgasm by fucking her in the ass isn’t possible.. unless they do like you and press in direction of the g-spot .
These days as well..you see straight guys using small vibrators inserted in their asses and try to keep cameras from recording them.. as this is helping them orgasm as well..
And guys that do see them think.. fuck he is gay fucking a woman.. isn’t true.
When a man’s body was made .. it’s not man’s fault that the part for sexual gratification to full extent is inside his asshole