[ Robin's mind is certainly not working in carnal ways at the moment, and he is also not noticing that he's attracted anyone's attention. He's just focused on buttoning his shirt, and yes, still singing quietly to himself. ]

...it wouldn't be in summer.
Seeing you in summer I never would go.
Your hair streaked with sun-light,
Your lips red as flame,
Your face witha lustre
that puts gold to shame...