Frankly, these stats are generalisations or idealised typologies that haven't a proper evidence base. Is there any info on sample size? Also, what is a 'Canadian' or a "South African', given that these countries are ethnically heterogenous rather than homogenous? Unlike the Congo, for instance, which is fundamentally homogenous and therefore more representative. Having spent a lot of time in Le Jardin and the Limelight on Stanley in the 70s, I experienced cocks of all sizes and ethnicities but I would hard pushed to arrive at a standardised figure. But, of course, I bow down to your superior knowledge on Indians and other Asians.