Every single girl is different. You may get responses here, none of which will be wrong, but none will be the "true" answer.
Some girls may think about a strong, big man while others may think of the front man for an emo rock band. Some may think of their best friend or of a tentacle. Some girls don't even masturbate.
So, just noting that your question has nearly infinite answers. All you really need to know is what turns you on and works for you.
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