What type of sexual dysfunction in MS is primarily caused by CNS lesions?

Primary sexual dysfunction in multiple sclerosis (MS) refers to issues that arise directly due to the central nervous system (CNS) lesions associated with the disease. MS is characterized by demyelination and neurodegeneration in the CNS, which can disrupt the neural pathways crucial for sexual arousal and response.

In individuals with MS, lesions can affect areas of the brain and spinal cord that are involved in the sexual response cycle, leading to challenges such as decreased libido, arousal issues, and difficulty in achieving orgasm. These dysfunctions are considered primary because they stem directly from the MS itself, rather than from other factors such as psychological influences or the effects of secondary medical conditions resulting from the disease.

Secondary sexual dysfunction arises from complications related to the condition, such as fatigue, depression, or mobility issues, while tertiary sexual dysfunction typically pertains to interpersonal or relational aspects affected by the disease. Thus, the key distinction is that primary sexual dysfunction is caused directly by CNS lesions, making it the correct choice in this context.