SPOILERS: The Itachiin twins were just putting on an act, merely to 'service' their Host Club customers. It's actually extremely rare for identical twins to have same-sex relationships, least of all incestuous ones. Actually, all the Host Club members are straight. The 'BL' is again, merely an act. OHSHC is a parody & satire of BL manga/anime.
BTW, Haado Gei is a heterosexual. And what you see in WWE? There's no actual competition involved (it's merely a contrived & choreographed act).
...in before 'MASTER OF THE OBVIOUS'/Captain Obvious etc.