It might be that her way of storytelling is so unique and full of details that he finds it hard to stay on the same page. For example, if she's talking about a sexual health campaign story, she may go into a lot of technical or personal aspects very quickly, and his lack of knowledge or slower processing speed makes it difficult for him to keep up.
It could mean that her story is very complex or fast - paced, and he has trouble following the details.
Perhaps she is very enthusiastic while telling the story and he can't match her energy in terms of understanding what she's saying. Maybe she jumps from one point to another quickly in the story and he gets lost. Also, it could be that she has a lot of background knowledge related to the story that he doesn't have, so he struggles to keep up with her narrative.
He may be distracted by other things.
It could mean that in stories related to bedroom activities (which could imply things like cleaning the bedroom or getting ready in the morning in a non - sexual way), he is not able to stay on top of things. For example, if the 'bedroom stories' are about keeping the bedroom tidy, he might be too lazy or unorganized to keep up with the tasks like making the bed or putting away clothes.
If you find it difficult to keep up with someone's story, whether it's about sex or any other topic, you could politely ask her to slow down. For example, say 'Could you please slow down a bit? I'm having a hard time following your story.'
Yes, it can be normal. If she's a very fast talker or if the story is complex, it's common to have trouble keeping up. Don't worry too much about it.
Without more context, it's impossible to say exactly who 'he' is. It could be a character in a specific story, or it could be someone in a real - life situation that is being talked about in general terms.
It could mean that the ex - husband is exaggerating or distorting details about their sexual experiences together. Maybe he has some ulterior motives like trying to make her look bad or gain some sort of advantage in a situation, perhaps in a custody battle or in their social circle.
It could mean that the mom is removing or censoring any inappropriate sexual content from stories. Maybe she is protecting her children from being exposed to such content.
It could mean that a story is incomplete or lacks a proper conclusion. For example, if a writer runs out of ideas or time, they might not be able to end the story in a satisfactory way.
Another option is to focus more intently. Try to eliminate distractions around you, like turning off the TV or putting your phone away. Maybe take some notes as she talks to help you keep track of the key points in the story.
It doesn't really have a proper meaning as the two concepts - sex and keeping war stories - are not related. It might be a very strange or misphrased statement.