Systems and methods for treating sexual dysfunction using transcranial photobiomodulation (t-PBM) with near infrared light (NIR) are provided. In particular, a device configured for treating a disorder of a subject, the device can have a power source and a light source configured to receive power from the power source to cause the light source to emit near infrared light, wherein the near-infrared light has a wavelength of 600 nm to 1400 nm. The device has a processor and a housing configured to position the light source to deliver the near infrared light to a region of interest of the subject via transcranial photobiomodulation in a dosimetry and duration sufficient to treat the disorder.
