She offers him dinner and he says no , but she wo n't let him pay either so they go Dutch and share the wine . She leans back in her chair and Paul 's eyes follow the graceful arcs of her collarbones and the way her pendent necklace drops to the hollow between her breasts . She watches his eyes and says , " Who is he ? " " Who ? " " The hotel .

Give answer the following question using evidence from the above passage: Why did his eyes went where it went ?
He was just following his male instincts .