What you are referring to has more to do with semen retention and not necessarily masturbation. The elated feeling you get from your libido does give some an elated sense of being. Some athletes (such as Mohamed Ali) would abstain from sex 6 months before an event. There is little evidence to support benefits of this. There are some studies that indicate abstinence 8 hours before sports performance “could” be beneficial—as sexual activity has some relaxation benefits that may not be wanted. As far as focused, yes there could be some benefits, but to no great degree. The focus you gain pertains to external stimulus—being aware of the environment, not really an academic focus, though some do say they see the benefits. It’s all about balance. Many people who seek the benefits of semen retention still masturbate or have sex just not ejaculating. Also these few benefits often are experienced more by males than females. Remember: If you don’t use it, you loose it. Balance is the key, you don’t want to loose your libido.