Who of the readers is familiar with the plot when there is a normative family, perhaps even with children, and with more than one. With their mentality, their family values, their rules and regulations.
The entire surrounding field, in which spouses and children interact, is responsible for the calm flow of relations. These are also social relationships - at work, at the clinic, at the store, at the gym, at the beauty salon, and of course important communication relationships. The family's social circles are relatives and friends.
If there are married couples in these circles, then this simplifies and stabilizes the relationship, but it happens that the husband or wife has a friend or girlfriend in the arsenal, very close, sometimes obsessive and may be beloved.
Often such friendship is a compensation for one's own unrealized needs in marriage, a life jacket in crises, "household psychology in the kitchen." And everyone in this threesome friendship has a goal in realizing their own benefits.
The wife benefits from her husband's friend, who is more talkative and generous with compliments, attentive to changes in the external and internal state. This friendship may be in the imagination of a woman ends with sexual discharge or vice versa feeds the inner libido.
Maybe the wife has a friend with whom you can rinse dirty family laundry, bringing yourself a short-term internal relief from pronouncing the problem. This friend becomes such a frequent guest in the house that the husband subconsciously feels a quiet "war" against himself.
A husband and a friend can engage in joint abuse against his wife, doing everything to elevate a woman's dependence to a peak position, break her self-esteem and provide a resigned, slavish and fearful consciousness that there is no other life.
Threesome love brings fresh impressions into sexual life, a new wave of attraction, colors the palette of sensations, giving all participants what they want from each other. Even if the third partner is physically absent, he is present mentally.