Briffault’s Law: Thaïs d’Escufon’s Analysis of Modern Couples

In her video, Thaïs d’Escufon presents “Briffault’s law” as a framework for understanding relationship expectations, couple instability and loyalty.

Why can a person leave a relationship despite the help, time or effort they previously received? In this video, Thaïs d’Escufon answers this question through “Briffault’s law,” an idea she presents as a biological rule for interpreting romantic relationships.

Her argument is based on a differentiated reading of male and female behaviour. She notably argues that, from this perspective, a partner’s value would be assessed primarily according to what they provide in the present and what they appear able to provide in the future. This analysis is the one developed in the video: it does not, in itself, constitute a scientific demonstration of human relationships in all their diversity.

Briffault’s law according to Thaïs d’Escufon

Thaïs d’Escufon attributes this notion to Robert Briffault, presented as an anthropologist from the early 20th century. She summarises the idea as follows: an emotional partnership would endure as long as it benefits the woman.

In her interpretation, this logic would not necessarily stem from malice or a conscious desire to cause harm. She instead describes it as a survival strategy inherited from biological mechanisms. The video therefore links female attachment to an assessment of the partner’s present and future usefulness.

The author contrasts this view with the idea of an “emotional savings account.” According to her, some men believe that their past support — during a difficult period, when facing debts or over several years of living together — permanently guarantees them gratitude and fidelity. Her thesis is that previous efforts are not enough to ensure the continuation of a relationship if perceived value in the present disappears.

Two situations highlighted in the video

To illustrate her reasoning, Thaïs d’Escufon offers two scenarios. In the first, a man would help a woman in difficulty rebuild herself, regain confidence and achieve a more comfortable situation. Once stable, she might, according to the analysis put forward, seek a partner better suited to her new circumstances.

In the second, a man who was initially ambitious and attractive would ease off his efforts over time. The video then refers to a loss of ambition, energy or the ability to surprise. In this reading, the status and dynamic that made the partnership attractive would no longer be perceived in the same way, thereby weakening the couple.

These examples are used to support a central idea: past investment alone would not guarantee the future of a relationship. Nor would the promise of future change be sufficient indefinitely if it does not translate, according to the author, into concrete elements.

What the video calls “usefulness” within a couple

In the video, “usefulness” is not limited to income. Thaïs d’Escufon believes that women’s financial independence would alter expectations towards a partner. If a woman can meet her material needs on her own, a man could no longer define himself solely by his role as a provider.

She then cites other dimensions: leadership, strength of character, emotional protection, networks and physical qualities. These criteria are presented as elements likely to create relational added value.

The video also puts forward the figure of 47% of women who would prefer to remain single rather than enter into a relationship with a man to whom they would attribute a lack of leadership or other qualities. The transcript specifies neither the study, the method nor the context of this data: it must therefore be regarded as a claim reported in the video, with no possibility of verification on the basis of it.

An opposition between male and female behaviours

Thaïs d’Escufon claims that men and women would not leave a relationship for the same reasons. She describes men as being more focused on preserving what they have built: home, habits, comfort and the investment made.

However, she qualifies her own description. Staying would not always be proof of loyalty or nobility: it could also be explained by the cost of change, the fear of losing one’s assets, the concern of seeing one’s children less often or the uncertainty associated with returning to the dating market.

Conversely, she presents women as being more oriented towards evaluating present and future benefits. This opposition, repeated in the video, leads the author to formulate a distinction: men would be more inclined to stay out of duty or convenience, whereas women would stay out of necessity. This is a generalisation specific to the video’s discourse, which does not account for all individual life paths.

Why would relationships be more unstable today?

The video links the contemporary instability of couples to three main factors. The first is “digital hyperchoice.” Apps, social media and profiles visible on screens would constantly broaden the field of comparison. Thaïs d’Escufon believes that this abundance creates the illusion that a better option is always available.

The second factor is women’s financial autonomy. According to her analysis, as historical material dependence on one’s spouse has decreased, the threshold of expectations when choosing a partner would have become higher.

The third factor mentioned is no-fault divorce. The author argues that separation would have become less of a deterrent for women and more costly for men, notably mentioning alimony, benefits and consequences for assets. These claims are made in general terms in the video and are not accompanied by any legal or statistical data that would make it possible to establish their scope.

Thaïs d’Escufon also mentions an average relationship duration in France of four years, while contrasting it with the image of couples who stayed together for several decades. Here again, the transcript provides no source allowing this figure to be contextualised or confirmed.

The risk of permanent optimisation

The argument is not directed solely at men. Thaïs d’Escufon warns women against what she calls permanent optimisation: repeatedly ending relationships in the hope of finding a superior option.

She believes that this logic could weaken attachment and lead to a succession of relationships assessed solely according to their immediate profitability. She also argues that replacement options would not remain constant over time, linking this idea to presumed value on the dating market.

Her message is that the constant search for a “better” partner can result in losing the benefits of loyalty built over time. She therefore encourages distinguishing a temporary phase of stagnation from a relationship that is permanently unsatisfying or marked by a lack of respect.

The proposed conclusion: knowing one’s impulses without submitting to them

Thaïs d’Escufon’s conclusion is intended to be less fatalistic than her initial diagnosis. She states that knowledge of supposed biological mechanisms should not lead to cynicism or systematic distrust towards women or men.

For men, she presents this view as an incentive to maintain direction, ambition and self-esteem. She nevertheless adds that loyalty would truly be tested when a man has more options, especially once he has acquired status and resources.

For women, she values not reducing a couple to an immediate search for stimulation or advantages. She advocates the idea of building a lasting project with an imperfect but dependable partner.

Ultimately, the video calls for discipline and clear-sightedness: recognising the impulses and interests that may run through a relationship without surrendering the direction of one’s choices entirely to them. Its final thesis is that a lasting couple would require both a man who refuses to become passive and a woman who refuses to reduce the other person to their usefulness at a given moment.

FAQ on Briffault’s law in this video

What does Briffault’s law mean in Thaïs d’Escufon’s analysis?

She presents it as the idea that a woman would maintain a relationship as long as she perceives a current or future benefit in it. This interpretation is the thesis developed in the video.

Does the video claim that women are “cruel”?

The title uses this term, but the author mainly explains these behaviours through a logic she describes as biological and opportunistic, rather than through an intention to cause harm.

What central advice is given to couples?

The video encourages people not to blindly follow their impulses, to maintain perceived value within the relationship, and to favour loyalty as well as a project built for the long term.