This statement is rather unclear and jumbled. 'Gram stories' might refer to Instagram stories. But the overall meaning is hard to decipher as it seems to be a random combination of words that doesn't form a proper, understandable sentence in a common context.
It could potentially be a very poorly worded or misphrased thought. If we assume 'gram' is short for Instagram, perhaps it's a really strange way of saying that the mother has a similar interest in something (not sex, as that's inappropriate) as shown in Instagram stories, but without more context, it's just speculation.
Well, the words 'wants sex' in this context are inappropriate and might be a wrong or shock - value addition. Maybe the person was trying to say something about a mom's interests related to Instagram stories, like how a mom might be interested in the same types of content as the speaker is when it comes to Instagram stories, but the way it's written makes it very hard to tell for sure.