This is what the manosphere chuds call "alpha fux, beta bux". They believe that when women are in early adulthood, they take advantage of their high sexual market value to go around riding the "cock carousel" - that is fucking many alpha chads. However, as women approach their 30s and beyond, their sexual market value diminishes significantly. As this happens, the alphas lose interest in her as a piece of meat, choosing younger and more nubile women as their source of poontang. This leads the woman into a crisis, as she can't get by from chad (because, you know, women don't actually work in the eyes of incels). Her biological clock is also ticking, as she knows that her window of fertility is reaching its end. Because of this, she goes for the only choice left to her - settle down with a beta so she can have stability and fulfill her biological imperative. Betas, low SMV soyboys that they are, leap at the opportunity to accept the woman since they can't get any puss otherwise. This leads to a marriage where the only sex the beta gets is infrequent and unentusiastic as the woman mooches off of his stable income to survive.