It's pretty much common knowledge that as a man ages things don't work quite the way they used to.
It takes longer to work up a decent boner,
and, once we've got it up, it takes almost constant stimulation (physical or visual) to keep it there.
Apparently masturbation does not count as a "sexual encounter."
And why would insurance companies use it for medical purposes? Oh, yeah...
According to the Dr.s Oz and Roizen, SD (well, ED, because, let's face it, the clitoris gets hard in the same manner a cock does) is (usually) a matter of poor circulation. Not enough blood gets to the area to get the cock fully hard
Well, the good doctors care about your boner. Yes they do.
So, they recommend: Avoiding tobacco and managing stress. Taking those 10,000 steps per day.
Adopt a heart-healthy diet while adding things such as Olive Oil and fresh produce.
I would also add, as any decent urologist would, encouraging the blood flow with lots of direct stimulation to keep the tissues healthy.
Put that last suggestion into practice immediately,
and have a great weekend.