Effect of Peripheral Neuromodulation on Vaginal Blood Flow - Study 2

Inclusion Criteria: All Participants * All participants will need internet access to complete the initial surveys and the diaries. Non-dysfunction participants * Adult (over 18 years old) cis-gender female * Neurologically stable * Sexually active at least once per month * Able to understand consent and communicate effectively with research team Non-SCI dysfunction participants * Adult (over 18 years old) cis-gender female * Neurologically stable * Sexually active at least once per month * Sexual dysfunction, per short-form Female Sexual Function Index (FSFI) score below 19 * Lubrication difficulties, per short-form FSFI lubrication subdomain score below or equal to 3 * Able to understand consent and communicate effectively with research team Spinal cord injured participants * Adult (over 18 years old) cis-gender female * Clinically diagnosed spinal cord injury (Impairment score A-B) at vertebral level within C6-T10 at least six months prior or clinically diagnosed spinal cord injury (Impairment score C) at vertebral level within C4-T10 at least six months prior * Nominally sexually active, but at minimum interest in sexual pleasure even if fully self-induced * Sexual dysfunction, per short-form FSFI score below 19 * Able to understand consent and communicate effectively with research team Exclusion Criteria: Non-dysfunction participants: * Male * Pregnancy or planning to become pregnant during study period * Sexual dysfunction, per short-form FSFI score below 19 * Lubrication difficulties, per short-form FSFI lubrication subdomain score below or equal to 4, or per investigator's discretion * Clinically diagnosed bladder dysfunction, pelvic pain, or other pelvic organ symptoms * Suspected or diagnosed epilepsy * Active infection or active pressure sores in the perineal region * Implanted pacemaker or defibrillator * Currently has or tested positive in the last 14 days for COVID-19 or is symptomatic for COVID-19 Non-SCI dysfunction participants: * Male * Pregnancy or planning to become pregnant during study period * Clinically diagnosed bladder dysfunction, pelvic pain, or other pelvic organ symptoms * Suspected or diagnosed epilepsy * Active infection or active pressure sores in the perineal region * Implanted pacemaker or defibrillator * Currently has or tested positive in the last 14 days for COVID-19 or is symptomatic for COVID-19 Spinal cord injured participants: * Male * Spinal cord injury at or above C5 level (C1-C5) if Impairment score A or B, or spinal cord injury at or above C3 level (C1-C3) if Impairment score C * Spinal cord injury below T10 vertebral level or reflexes not preserved * Acute worsening in motor or sensory function in the last month * Suspected or diagnosed epilepsy * Pregnancy or planning to become pregnant during study period * Active infection or active pressure sores in the perineal region * Implanted pacemaker or defibrillator * Currently has or tested positive in the last 14 days for COVID-19 or is symptomatic for COVID-19