I wouldn't be comfortable with it from the point of view that I do not want my daughter to feel comfortable being in close naked proximity of a variety of people. I want to teach her about personal boundaries. As a step parent who came on the scene when the boys were 3 & 5 I refused to shower with them and kept private, partly to cover myself since their mum is a bit unstable and will make stuff up when she doesn't get her way and partly because I don't feel comfortable as they aren't my blood. If I had been doing it since they were tiny babies it might be different but that is my boundaries. I would be livid if those wishes were not respected.