Any time one can consciously choose to do or not do something, as opposed to automatically, he is strengthening his resolve and will benefit mentally. If you choose not to have sex while wanting it you will be mentally stronger and there for more confident (unless you are resenting self - or projecting it onto a trainer etc thinking they are controlling you).

Its mental focus and strength... why not have sex and "pinch" it (hold in the ejaculate) - there's some training - work core big time, mental too... can always pinch physically - that way you get to have sex, work core, work mental and save the Qi in the ejaculate (very very high life force in there)