'When I look at my partner radiant and confident,’ — [that's] probably the biggest turn-on across the board.

Perel is pointing to a recurring theme in her work on erotic desire: attraction often intensifies when we perceive our partner as a full, self-possessed person rather than as an extension of ourselves. “Radiant and confident” signals vitality, autonomy, and self-regard—qualities that can restore a sense of mystery and separateness that long-term couples sometimes lose amid routine, caretaking, and familiarity. The remark also implies that desire is not only about physical traits or technique but about the emotional and existential posture someone inhabits. In this view, cultivating one’s own aliveness—purpose, play, competence, social energy—can be an aphrodisiac within committed relationships.