Asian women—they're practically all I jack to, nowadays.
Addendum: Just noticed you explicitly qualified your OP by nationality, rather than ethnicity. In that case, I'd say it's a tie between Japanese, Thai, Khmer, Vietnamese, Indonesian, Malay, Korean, Chinese, Taiwanese, Singaporean...you get the idea.
I've always been into pale white women with big butts and hispanic/latin women. That's just preference though, the penis does not discriminate. Well, didn't discriminate before I was involved with someone and got married.
White male...dont know what I am made up of really.some native American on dads side...but mostlyredneck /country in the family .anyway....i had a kid with a Ukrainian girl over here on some type of work program....the accents sexiness went away but yea I fell in love with her.i am into and wouldn't mind seeing how being with an Asian girl .or even a black girl from light to dark depending on what attracts me.who am I kidding I would like to try every nationality.
straight white male here, I'm hella attracted to Australian girls their accent just turns me the fuck on... english girls i really can't stand i hate their accents, also eastern european women are like my dream, lately tho i been talking to a mexican girl lol never was attracted to them but this one is cute