So many people run out of gas in their 40s due to boredom, work related, child raising related stress that they stop having sex except on anniversaries, etc. It happen to us..we even stopped changing clothes in sight of each other. Then all arguments and stress got stronger while we even forgot the good times. I realized this and then started changing in bedroom, spooning before sleep, light touching and after month and a lot of wine at night wife came around and other things became easier once we stopped living like brother and sister. The disagreement got smaller, etc