I dont understand how people can be so open about their sex lives as parents but so secretive about their lack of sex lives as parents.

I dont have kids but most of my friends do. I see a ton of post like "oh yeah, we did it this morning" or "we did it last night" but when I ask them do they still do it frequently I get met with a no and "we wish we had time" or "we're too tired" but refuse to admit that it's due to the kids. I dont understand how you can be so open about having sex before but not having it anymore after kids.