**Core Concept**
Dual sex therapy is a form of psychosexual therapy that aims to address sexual dysfunctions by treating both partners, rather than just the individual experiencing the dysfunction. This approach recognizes the interdependence of sexual function and relationship dynamics.

**Why the Correct Answer is Right**
Dual sex therapy typically involves a team of healthcare professionals, including a sex therapist and a physician. The sex therapist works with both partners to identify and address underlying relationship issues, communication problems, and emotional conflicts that may be contributing to the sexual dysfunction. The physician, often a urologist or gynecologist, addresses any underlying medical issues, such as erectile dysfunction or vaginal pain. By addressing both the psychological and medical aspects of sexual dysfunction, dual sex therapy can be an effective treatment option.

**Why Each Wrong Option is Incorrect**
**Option A:** Dual sex therapy is typically reserved for individuals with severe or treatment-resistant sexual dysfunctions, rather than being a first-line treatment for all sexual dysfunctions.
**Option B:** Dual sex therapy does not solely focus on individualized treatment plans for each partner, but rather on the couple's dynamics and interactions.
**Option C:** Dual sex therapy is not a form of individualized therapy, but rather a couples-based approach to addressing sexual dysfunction.

**Clinical Pearl / High-Yield Fact**
Dual sex therapy highlights the importance of addressing relationship dynamics and communication in the treatment of sexual dysfunctions. By recognizing the interdependence of sexual function and relationship health, healthcare providers can develop more effective treatment plans that address the complex needs of their patients.

**Correct Answer: C. Dual sex therapy is a couples-based approach to addressing sexual dysfunction.**