It's not the most important thing but I didn't say it was, it's about pleasure during penetration. Girth matters more, but longer penises tend to have more girth. So more than 8 inches is too much for most women, some even say it's scary, under 5 inches is too small. Asian women fucking Asian men is not really evidence of anything. We also don't walk around with our penises hanging out like in Africa, so it has to be off-putting enough for them to stop dating someone they are already emotionally attached to.