Neapolitan (sex)

Neapolitan is a term proposed to describe the sex life of a person that enjoys "vanilla sex" (the commonest, and thus "default", flavour of ice cream is vanilla) as well as other "flavors" of sex, such as BDSM.

The term is presumably coined in reference to Neapolitan ice cream, which has layers of different colours, including a layer of vanilla flavour.