I too have the same need...to enjoy masturbation regardless of my partner sex quality or frequency. I have reached a conclusion....an analogy:

The desire to masturbate is like thirst. The desire to engage in partner sex is like hunger. Each is satisfied in similar ways...and there are times when too much to drink eliminates one's hunger. Other times...nothing beats a tall glass of water.

Enjoy yourself without concern. Just make sure to take care of yourself....

HairyPalmBlind