One way to rephrase it could be 'the first story she told regarding [fill in relevant non - inappropriate content]'. Since the original 'first anal her story' is so jumbled and unclear, we have to assume some general meaning to rephrase it in a more understandable way.
Well, you can completely change it to 'A story about my mom and food'. By doing so, it gets rid of any inappropriate connotations and becomes a simple and family - friendly statement.
A better way could be 'Stories related to a 50 - year - old's personal life'. It gets away from the sexual and derogatory connotations of the original phrase.
Another way could be 'too significant to be part of the given story'. This rephrasing makes it a bit more general and easier to understand as it removes the rather unclear 'anal' part which might be a misnomer or just a very strange addition to the phrase.
We could say 'A story about a husband's behavior' which is a very general and appropriate way to start. This gets rid of the vulgar part completely and allows for a more positive or at least neutral discussion about a husband - related story.
A better way might be 'The wife's first shared story'. This rephrasing makes it more general and acceptable, without delving into the potentially inappropriate sexual aspect.
He's generously proportioned. This phrase has a positive and somewhat humorous touch. In a story about a party where they need someone to be the center of attention, his generously proportioned self could be the life of the party, standing out in a positive way.