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Message: <blockquote data-quote="Sabeth" data-source="post: 28104" data-attributes="member: 545"><p>You can try to see if your T has a horizontal slit on its underside between the book lungs…this is not 100% accurate but if you see a slit there's a good chance you've got a female. Males characteristically have a round-shaped spot in this area, known as the "bull's eye". Also in females there is usually more space vertically between the two pairs of book lungs.</p></blockquote><p></p>