I buy the River comparison, but for some reason I'm more hesitant about the Cylon one. I think it's because the Cylons (well most of them anyhow--seemingly) aren't programmed: they just have lots of sets of memories.

E.g. the Eight in Season 4.0 who massages Helo's neck. He protests saying his wife does that, and she says she knows, she accessed Athena's memories. And Helo is fairly squicked.