When I was young, I found that if I tensed my PC muscles (the muscle you sqeeze to stop urinating or peeing) it made the sensations of masturbation more intense.
It also was very obvious to me when I was starting to orgasm because I would loose voluntary control of these muscles and start pulsing. I THOUGHT they were all the same muscle, but it was probably a combination as the prostate is the main muscle for ejaculation, and that's what pulses.
So, to answer your question, yes, control over your PC muscles will give you a better orgasm. Whether you should NOT tense these muscles is a personal preference. Personally, I think I came faster when I tense and attempt to hold these muscles taught. But whether it's a better orgasm is something only you can decide for yourself.
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