“Proposed” is language that suggests marriage. However, the union suggested is “proposed” by lust: the union between the speaker and his lust. The passive construction of the verb conceals the identity of the proposer. It is thus not clear whether the “joy” of sex is proposed by the dark lady or by the speaker’s own instinctual nature. The syntax here mirrors that of line 8: “On purpose laid,” a phrase which places responsibility on the woman. The speaker externalizes the blame for his lustful actions.
