Is not enjoying sex a sign of psychological problems?
Generally speaking, not enjoying sexual activity is not necessarily a psychological issue. It may not be related to psychological factors if it's short-term or caused by non-psychological reasons. However, it could indicate a psychological problem if it persists long-term and is accompanied by psychological distress. If concerned, it is recommended to seek medical advice early. The detailed analysis is as follows:

If the lack of interest in sexual activity is temporary—such as due to recent high work stress, physical fatigue, or brief conflicts with a partner leading to emotional distance—and there are no ongoing feelings of anxiety, depression, or other psychological symptoms, this situation is usually related to physical condition or relationship dynamics rather than a psychological problem, and may improve with appropriate adjustments.
If disinterest in sexual activity persists over a long period and is accompanied by resistance to intimacy, self-criticism, low mood, or past negative sexual experiences that have caused psychological trauma, it may be linked to psychological issues such as sexual psychosexual disorders or depressive symptoms, which require professional evaluation to determine the underlying cause.
To determine whether lack of interest in sex is due to a psychological issue, both duration and associated emotional states should be considered. If the issue causes prolonged distress and cannot be resolved independently, it is advisable to seek help from a psychologist or qualified counselor to avoid delays in necessary intervention due to misunderstanding.