Treatment of impotence

Not likely, but possibly depending on the persons underlying diagnosis in conjunction with other appropriate points.

I would recommend you start by reading:

“Acupuncture point treatment plan” preparation guide
and
“What Does Acupuncture Treat”

Long story short, acupuncture is not a point to condition modality. You will get very poor results, if any, by treating symptoms and not causes.

While not necessarily related to impotence, the following blog article entitled “low testosterone, depression, and the aging man” highlights some of the possible underlying issues in men with sexual function issues.