Laws and regulations regarding divorce vary significantly from one country to another, and even within countries, they can differ at the state or regional level. Therefore, the specific legal grounds for divorce, including whether lack of physical satisfaction is a valid reason, depend on the jurisdiction in which the couple resides.
In many jurisdictions, modern divorce laws have moved away from the traditional "fault-based" approach, where one spouse had to prove the other's wrongdoing to obtain a divorce. Instead, many places have adopted a "no-fault" divorce system. Under a no-fault divorce system, a spouse can typically seek a divorce without proving any specific wrongdoing on the part of their partner. They may simply state that the marriage has irretrievably broken down and cite "irreconcilable differences" or "irreparable breakdown of the marriage" as grounds for divorce.
In this context, the specific reason for not being physically satisfied with a spouse may not necessarily be a legal ground for divorce on its own. However, a spouse may still seek a divorce through a no-fault system by stating that the marriage has irretrievably broken down due to a lack of compatibility or differences in physical intimacy, among other reasons.
It's important to consult with a qualified family lawyer or legal professional in the relevant jurisdiction to understand the specific divorce laws and grounds for divorce that apply in a particular situation. These professionals can provide tailored advice based on the individual's circumstances and local laws.