Like anythying else, if you have a top 10 percentile of something you might be able to swing it into sex. So if you come from a household making 150k+ a year, you yourself are making 90k+ per year, you are 6'2''+ (real 6'2'', so what tards here call 6'3'' or 6'4''), you have a top 10th percentile musculature etc.
Women are relative creatures. They compare you to other men relatively, so if you have an 8+ inch dick then you can probably swing that into sex IF you have a social circle. You have to leak the info about having a big dick and maybe get an obvious erection in a public space or something.
But for most people it's a dumb question. I mean, your dick size is a mystery until the pants come off, and sex only isn't going to happen once the pants are off if you're hilariously small, or hilariously big and she can't handle it. But she'll still blow you.