Is it normal to have a wide variety of turn ons which come and go?

Everyone has turn ones, but mine are varied and come and go. Like one weeks it will be girls squirting, next fat girls, next guys ejaculating, next shemales, next ebony girls. If one thing is the turn on, nothing else will do it. From one extreme to the other, one day I can't cum if there are dicks in the video, next day I can only cum if it's nothing but cocks cuming.