Well, it's a complex issue. Some may argue that they are not ethical as they often involve objectifying the human body in a sexualized way. It goes against the values of respecting others and promoting healthy relationships. In many societies, this kind of content is not considered appropriate for public consumption and may have a negative impact on the perception of gender and relationships.
In general, sunbathing nude in public is not appropriate as it goes against social norms and decency. However, in some private and secluded areas where it is legal and not visible to the public, a mom might choose to sunbathe nude if she feels comfortable. But she should also consider the potential impact on others if accidentally seen, such as her children or neighbors.
There may not be a widely known 'nude family story' in the mainstream sense as the concept might be considered inappropriate or misinterpreted easily. However, there are some stories in the context of certain art movements where families have been depicted nude to convey deeper meanings such as innocence, unity, or the natural state of humanity. But these are more in the realm of art history rather than a common 'famous' story.
Swimming nude as a boy is not acceptable in most settings. Public places have rules about proper swimwear for a reason. It protects the privacy and comfort of others. Additionally, it can lead to various problems such as potential harm to one's own body from the elements or possible unwanted attention.
The world of literature is vast, but when it comes to nude short stories, this is not a recognized or celebrated category. We should look for great short stories that uphold moral and ethical values. For example, the short stories of Guy de Maupassant that often deal with the complexity of human nature in an appropriate way.
Ethics here is a complex matter. If the wife is a professional model and posing nude is part of her work, and she has the full support of her husband, it could be considered within the realm of ethical behavior. But if it's done without considering the implications on her family, friends, or society at large, it might be deemed unethical. There are also legal aspects to consider, such as whether the photographer is operating within the bounds of the law regarding privacy, copyright, and use of the images.