I love japanese girls.
 

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How to say/write: "I love japanese girls".
Is "watashi wa nihon josei daisuki" or
"Watashi wa Nihon no on'nanoko ga daisukidesu" right?
I know there are some differences between "age" and "love and like", so... girls = "women/ girls" over 18; I guess you know what I mean :D

P.S. In Rōmaji, please.
Thank you in advance for your help.

I read you're not supposed to say that. It's kind of...they might ask ''Why not American girls,why not Hispanic girls,why not Native American girls?'' Average-looking Japanese girls and good-looking white/black girls do turn up.

I believe this is what you're going for:

日本人の女の子は大好きです。

ローマ字：
Nihonjin no onnanoko wa daisuki desu.

I'm not sure if "onnanoko" is the correct word to use in this situation, but I think it is!

Of course you can also drop off the 私は (watashi wa), because the context is implied.

I'd say :

日本人の女の子が大好きです。　

as you are talking about women in general　and が suggests here that it is YOU who likes them and not THEM liking something else.

I can't explain you the grammar because I am not a language teacher, but は would be used in this context.

日本人の女の子は子犬がすきでしょう。

Which means, "Japanese women like small dogs, right?"

「日本の女の子は大好きです」sounds to me like 'About Japanese girls, I like them.'

「日本の女の子が大好きです」is more like 'I like Japanese girls,' I think.