Who is affected by sexual dysfunction?

Everyone is affected at some point. Given that sexual function is impacted by stress, physical illness, social dictates and more, there will come a time in everyone's life when sex is not an option and/or a desire. In the same way, physically healthy people will still catch the occasional cold, etc.  Dysfunctional is the flip side of functional. They come together and are both experienced in life. However, when dysfunction persists beyond the transient cause, its time to seek advice from a professional to make sure the cause is transient.