Final answer:
In 'The Handmaid's Tale,' it is Serena Joy who first suggests that Offred has a physical relationship with Nick to increase the chances of pregnancy.
Step-by-step explanation:
The subject of the question pertains to the literary analysis of a specific theme within a text, that is, the broaching of the topic of a physical relationship between characters.
In the context of the book 'The Handmaid's Tale' by Margaret Atwood, the character who first suggests that Offred should engage in a sexual relationship with Nick is Serena Joy, her Commander's wife.
The suggestion is part of a strategic plan to increase the chances of Offred becoming pregnant, as the Commander is likely infertile.
This action by Serena Joy crucially impacts the storyline and Offred's personal narrative, as it represents a deviation from the accepted norms and expectations of the dystopian society in which they live.