I am a male, 27 and currently not on meds.  I have been experiencing this for the past year  or so: Difficulty simply becoming aroused and entertaining sexual thoughts. I also experience a lack of pleasure when masturbating and weaker erections. Occasionally I feel my horny self, but those days are rare. I can get erect, but there is a huge lack of pleasure or build up associated with the erection; a numb erection. Also, when I watch porn, I have difficulty simply getting turned on by what I am seeing and my mind wonders. I have abstained numerous times and it doesn't seem to do anything. 

I know that I have been experiencing crippling depression and anhedonia, but these symptoms for the most part, seem too consistent. Is it possible that depression and depression only is the cause? can anyone relate?