physical abuse worsened after she'd caught alexander ma masterbating to a photo of a young boy. >> it was a negative experience for me and it's not something i wished to remember. >> another week, another sex tape. this time the defense played mainly alexander's voice in effort to play him as the more experienced sexually. >> we've had two and three-hour sessions many times. >> reporter: the defense did all it could to clean up arias' image, even trying to explain away the text message arias sent alexander suggesting she dress up like a dirty little schoolgirl. >> the idea of the schoolgirl in the outfit, was that something that you were interested in? or was it something you were doing to please him? >> it would be more for his