I would say that 0% of women can orgasm from vaginal stimulation, because all orgasms which occur via vaginal penetration are actual clitoris orgasms because the internal forces stimulate the deeper subdermal roots of the clit.
Where did you get that bullshit G-spot measurement?
Due to variations in female anatomy there is not going to be a fixed depth of the graphenberg spot: the skene's glands will be located at differing depths just as there are different vaginal depths overall.
Also where are you getting the idea that 30% of men have penises over 7.5 inches long?
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according to BDP chart only 1 in 1000 men (0.1%) have a penis length of 7⅛ so you're probably approaching 1 in 10,000 territory by the time you get to 7.5
penis size does matter for orgasms (though I have reason to think girth could matter more than length... but they tend to go hand in hand so it's nitpicking) but so does foid attraction/arousal to other stuff because that causes the clitoris to get hard (and tissues connecting vagina to clitoris) so that it can get rubbed by the sex
kind of like how it's harder to orgasm by rubbing your cock while it's flaccid compared to when it's hard
except it's not like a hand: try to imagine fucking an onahole with a flaccid cock and orgasming that way, it just wouldn't work, if you're not aroused/erect you can't get the required friction along the length through standard sexual motions
if I were able to induce an orgasm in a foid she would like that and perhaps give me further sexual access to her
why ask something so obvious?