Conditioned to stay Limp ?

[Sub-Cocksucker]

First a quick background about me.
For stead my first cock when I was 19 it changed me forever addicted to cock ever since.
Had my first true Dom in my mid twenties which lasted about a year.
Pretty much completely broke me and threw me down the sub rabbit hole.
Had some on and off relationships with other dogs over the years and sucked off crazy amount of strangers cocks.
Now in my mid 40s I have two Doms that I service on a very regular basis.

I would never get hard while being penetrated but what always get hard while sucking cock.
I have noticed that especially being used as often as I am between my current two doms, 
that my balls will slowly ooooze and empty (ive never full on CAME from anal)
Once they send me home, my balls are empty, but Im still HORNEY, but alot of the times could not jerk off, since I would stay limp.
One of my current Doms hates when I get hard, and any time I barely get hard he will beat and squeeze me balls till im limp again.
He has been very strict about this for about 6 months now, and lately, I cant get hard at all.
I am, well, was, a chronic masturbator, so I have mixed feelings about this.
Its frustrating, but I cant help but also be turned on by the thought that, these Doms could have conditioned me to be this way?
I honestly dont think its a case of simple ED, has anyone else experienced this? 
Have I actually been conditioned and trained to be so sub that I now stay limp?