sentences:  The speaker's sin, on the other hand, is to betray himself by allowing his body rather than his soul to steer his actions.It uses the body as a metaphor for the penis, "rising" and "falling" with an erection when aroused, and so reduces the speaker to nothing more than his phallus; by giving in to his desires he enslaves himself to the "Dark Lady".Sonnet 151, with a "bawdy chronicle of erection and detumescence", contrasts with Sonnet 55's "grandiloquent expression", but their theme is the same