Board Thread:Questions and Answers/@comment-39665740-20190605213457/@comment-26091443-20190610054904

My answer to this question is "yes, until given a reason not to think so." Yeah, it's kind of weird, but if all nine titans are part of Ymir's "soul", I suppose this is just the part representing her gender. Marley (and Eldia beforehand) have had over a century to figure this stuff out. If it weren't exclusively female they'd have no reason to call it such.

You're overthinking it. Rather than question why the Female Titan would be exclusively female, a better question (and one you seemed to bring up) is what exactly is supposed to be unique about the Attack Titan. Because it's the one that actually stands out.