For me my submission involves sex; without it, I am nothing more than a slave. Why? Because the sexual act is to me the ultimate expression of love
between a man and a woman, or between partners. Of course love can be expressed in many ways but what makes "couples" different from friends is the sexual part of their relationship. A Dom who does not include the giving and loving part of a relationship, including the sex, is not a Dom, he is a Master ,and you are no more than a slave.
There is a big difference between slavery and submission. In the first, your needs are never considered by your master except for the most basic ones, in the latter, your spiritual and emotional needs are important to him/her. The sex is important because it is a basic emotional and physical need of human beings.
Men (Doms included) and women can be lazy in many ways, and laziness in the bedroom has ruined many a good relationship. If your Doms enjoyed the blow job and came, then it wasn't that they had problems performing, it simply was that they were too lazy to find out and take care of your needs too.
I have seen it too many times. Marriages/relationships ruined by this lack of consideration and effort by one or both partners.
Age has nothing to do with it. I have known very young men who are sensitive and caring and who work hard to please their partner, and many an old man who knows nothing but slam-bam-thank you ma'am and calls a woman frigid if she doesn't cum during his five minutes of "foreplay."
Decadence, I have the feeling that your "problem" had nothing to do with you.