Eating Feces: The Sex Life of Married People.
The first sexual intercourse between a man and a woman should result in pregnancy; if it is not planned, what is the point of having sex with the same person more than two or three times?
Marriage and sex are opposite, though related, processes, like eating and emptying. The task of marriage is to conceive, give birth, and raise a new person in a shared household. The task of sex (intercourse without conception) is to explore new territories.
Just as a person gets used to a new shirt or gadget, sex with the same person becomes predictable, monotonous and, given the inquisitive nature of Homo sapiens, affects them destructively.
Instead of jerking off using your marriage partner who can only offer you a repetitive experience, buy a sex toy and open a picture of your favorite model. Not only will it give you a new experience, but it will also save you energy and time. And if your energy is enough to explore new territories, then move forward and have fun.
Having sex with a parenting partner is like eating your own feces. Either a masochist or someone who is sexually unattractive to most people around them can afford it. If another reason compels you to eat one and the same product over a long period of your life, make lemonade out of lemons, learning from masochists how to enjoy the process of suppressing human nature.