Welcome to the first installment of #TuesdayTerms! Learning new words can be fun! Here, we’ll define a word or two related to sex, gender, kink, BDSM, fetish, and more.

Alvinophilia is a partialism in which a person is attracted to the human belly button or navel.

Alvinolagnia or belly fetish or stomach fetish is a partialism in which a person is sexually attracted to the stomach or belly.