Tickle fetishism
Tickle fetishism, also known as knismolagnia, knismophilia, or titillagnia, is a paraphilia where an individual receives sexual pleasure from tickling, being tickled, or watching someone be tickled. Individuals may prefer to be the dominant party, known as a ler (from tickler), or the submissive party, known as a lee (from ticklee), or they may enjoy both, known as a switch.