Ditto that.
As for the question itself, I'd have to say it generally does not matter. I've bottomed for (and topped) guys of a variety of nationalities, ethnicities, or "races" and there has been no correlation between me having a great to excellent time and my partner's ethnic background. What does make a difference is his focus upon and desire to share a powerful sexual moment together rather than simply blow his load; how sensitively attuned he is to my body's responses; and how well we know each other.
I am a dancer, and one thing that I have noticed is that hip rotation and variation of the angle of penetration adds to my pleasure as a bottom. I would say that my level of sexual satisfaction has been higher on average with latin and black men. I think that is not because of race, but because in my experience black and latin men more often use hip rotation and other techniques to vary the tempo, angle, and depth of penetration.