1. To act as a go-between or liaison in sexual intrigues; function as a procurer.
This could be like a pimp or anyone who gets one party to have sexy feelings for another party who is already interested.
2. To cater to the lower tastes and desires of others or exploit their weaknesses: “He refused to pander to nostalgia and escapism”
Middle English Pandare, character who procured for Troilus the love of Cressida in Troilus and Creseyde, poem by Geoffrey Chaucer (ca. 1342–1400)