?

"I think of you with the most excruciating tenderness."

Pubic hair

Stretch marks

Scars 

Any other natural occurrence of the female form

It was a time before photography, when “people were desperate to give each other not just images of themselves, but part of themselves,” she [Grootenboer] told Artsy. (…) Instead of standing in for the whole person, [the lover’s eye] depicted just a minute feature. What’s more, they embodied a specific action: the gaze. “It is the look of someone that the [lover’s eye] is a carrier of,” Grootenboer explained. “It is the look that someone wants to imagine, and wants to feel as resting upon themselves.” (…) “In that way, they articulate the essence of portraiture: the act of looking at you, the ability of a painting to hold you in its grip.”

Time