whatever turns you on

Idiom of “whatever turns you on”

an idiomatic refrain, generally in use as a put-down cliché, with a meaning which often combines ‘Do it if you must, but don’t expect me to join you’ with ‘I always knew you were unusual or lacking in good taste (etc.), and this proves it’
http://www.dictionarycentral.com/definition/whatever-turns-you-on.html