I will be honest LL fantasies and preferences are deeply ingrained. However in most cases fantasies are just that and often sharing them with your partner can be very arousing even if your not acting them out.
If you think about it 60% of your arousal maybe more is mental, so I certainly think it's possible to widen the the range of things that turn you on.
Usually abstinence is the quickest way to lower the level of stimulation you need.
That applies for mental stimulation too.