I feel like I'd go for the clumsy, sentient-machine trying to learn about how to be a human, with subdued, quiet, and reflective emotional responses that she doesn't always understand. She just doesn't "get" a lot of things, but keeps trying.
I'd also do everything in my power to install an "innocence" function, that at will selectively cut off all memories of lewdness to have a "first time" again and again. Restore 'em afterwards, of course.
Maybe expand that function to more topics as well. Having her first slice of cake, watching her first sunset, and many more firsts on repeat appeals to my sensibilities.