Does the tale Sir Gawaine and the Green Knight make references to seduction and sin?

While the Green Knight is hunting, a careful dialogue follows between Gawain and the lady, where he delicately and diplomatically evades and parries her sexual advances. First, the lady threatens flirtatiously to keep him prisoner; then praising his greatness as a knight, she assures Gawain that their situation is secret and offers her body to him. Gawain replies that he is "certainly honored", but declares himself wholly unworthy for a lady as good as her.