erotic: [17] Érōs was the Greek word for ‘sexual love’ (as opposed to agápē ‘brotherly love’ and philía ‘friendship’). The concept was personified in Greek mythology as Érōs, the boy-god of love. Its adjectival derivative erōtikós arrived in English via French érotique. [erotic etymology, erotic origin, 英语词源]
1650s, from French érotique (16c.), from Greek erotikos "caused by passionate love, referring to love," from eros (genitive erotos) "sexual love" (see Eros). Earlier form was erotical (1620s).