My ex-partner and I split up just under a year ago but we continue to be friends and we continued to sleep together. She has fallen pregnant now but we both understood that I did not want children while she did and that if she fell pregnant she would keep the baby but that I would not act as a parent. She's seems completely fine with this arrangement but just to protect both of us in the case of a change of mind I'd prefer to have some kind of legal grounding that I have neither rights nor responsibilities as a parent. I am just wondering how this could be done? I definitely don't want to force her into anything but assuming she is willing I feel we'd both feel more peace of mind this way; me that I won't be asked to become a father later down the track and her that I won't suddenly start demanding custody.