I am in an interesting place here. I am a Hispanic who has dated Hispanics, Whites and Asians.
I think any wide generalization is stupid. I have met Hispanics who are small, I have met Whites who are VERY small. I have met asians who are average or above.
The largest penises I have seen? White and Hispanic
The smallest penises I have ever seen? White
I think if I were to make a generalization is that Hispanics tend to be slightly thicker. Compared to Asians and Hispanics, I think Whites are slightly thinner.
I also think that White guys do tend to have bigger testicles usually.
None of these generalizations are rules. There are always exceptions.
I think having an expectation based on this generalizations can be a bad thing.
Be in love with the person, not the stereotype or expectation. Be in love with the culture, not the penis.
There are definitely other things that are different between a white guy and a Latino other than the penis.
some of those are more critical for long term relationship satisfaction than how big a guys dong is.