I know a lot of guys are going to say their ED and sex drive "went through the roof" when they started a TRT protocol...but there's more and more evidence that may be more placebo then anything else. Many guys still need a PDE5-I to help with erections while on TRT and many still seek ways to increase libido as well.
Testosterone, in my opinion, is not the Valhalla for increased libido and erections as many will make you believe. The complexities between the sympathetic and parasympathetic pathways are very complex.
Interesting study:
http://www.webmd.com/sex-relationshi...y-not-treat-ed