Well, the fact that Lex prefers brunettes is undeniable based on canon. As regards the reason behind his choice... it's true that we usually seek what we know and that we unconsciously feel attracted to people who have certain physical features which remind us either of us or ours. Julian making a reference to what Lionel used to say in canon is natural considering he was raised by the MB; there must have been a certain degree of "pollution" despite the great relationship Julian's got with his eldest brother.
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