I wasnt talking about love because you can love your wife while you let other man get her pregnant because you cant for some reason (people in past days used to do it to get a stronger seed to have a strong offspring that can take of them later in life)Well i can't speak for others but true love isn't about having children, i mean, i can't get my girl pregnant but i still love her and consider her as my true love
cuckholding specificly is a whole set of humiliation of the guy by his wife and a stronger guy which fair enough kind of happens here by his wife apperantly being cold to him but its not humiliation that the dog tell him how weak he is or even is wife not telling anything or even getting pregnant by the dog
its the wife found out some intense kind of sex where she can be very free about it and also the dog naturaly treats her like a sex object for sexual gradification which women love if it is done only in sex while after sex they want some respect