My wife (57 kgs) use to sit continuously 2 hours completely on my chest while watching tv. Is it harmful?

I doubt it.. you would be dead if I sat on your chest at 68 kgs.. Are you sure she is not a giant cat.. cats like to sit on peoples chests. or stomachs.. never heard of women doing that.. if you feel your ribs are cracking ask her to sit on your lap instead.. less risk of damage that way.. how can you both watch Tv if she is sitting on your chest anyhow?