Straight, Bisexual, and Scat categories are disabled by default for a few reasons, but they can be turned on for your account. Simply click the "Profile" tab at the top of the page, then check or uncheck the category check box, then click "submit changes" at the bottom of the page. Note: These settings are DIFFERENT from the section with all the categories, which I suggest you leave blank anyway. They are a SEPARATE option near the top of the page.