While editing a profile, under the settings, you're given the option to flag your profile as sexual. However, you're still given access to every interest, including those which are overtly sexual. (Worse, new profiles are shown every trait, sexual and otherwise, before even being given the option to flag the profile as sexual.) It would certainly open the site to a broader audience if this wasn't the case.
The only issue I can see is determining which interests to flag as sexual (and hide from profiles not marked as sexual) and which to keep. Many are obviously sexual (penetration, oral, orgasm control, etc.) and many are obviously non-sexual (world-building, telepathy, adventure). There are many that sit on a weird middle line that are fetishy -- not sexual on their own, but generally used in a sexual context. Things like mind control can be used to create plots around unwitting betrayal, for example, but are more commonly focused around the whole sexy loss of control and power exchange thing.
tl;dr : If Litphoria is looking to distance itself from a particular roleplay site where a presumable chunk of its userbase migrated from, make more of a distinction between sexual and non-sexual profiles. Alternatively, move the profile age-wall to be shown at account creation (or whenever a visitor is not logged in), and assume all profiles are sexual.