This is a phenomenon that has been brought up for many decades but never really spoken about publicly. Men losing the sensation they feel when having sex with a long time partner. Their mind is not warped, nothing is wrong with them they have just been with their individual partner for so long that they no longer feel sensation when having sex with that partner. Please do not shame these men about this. I am a doctor and I also counsel men about marriage and this topic is something that comes up often. There's usually nothing that can be done. Some wives get vaginal reconstruction, but we don't have the statistics to say it works and the woman has to be willing to do it. I would also like to add that the individual named Ben has a very pompous attitude that he knows everything. If you haven't been in a long term relationship which it sounds like you never have I'd sit this one out.