Smooth muscle contraction forces semen through the urethra located in the penis corpora muscles. The urethra houses and transmits urine to the exterior as well. The question that is asked frequently is how can two different substances travel through the container without contaiminating both? The answer is because of precum, a lubricating, clear, sticky formula, cleans the urethra before ejaculation.

Semen leakage is a sign of the weakening of the parasympathetic nerve that keeps the ejaculation valve closed and helps to maintain an erection. If this electrical feedback loop develops a problem, eventually erectile dysfunction can develop.

For people with weak parasympathetic sexual nerves, 20-30 minutes of foreplay can drain their bodies stored sexual energy, referrred to as "bioenergy". Once the bioelectric voltage in the parasympathetic nerve runs low, the penis will become limp. Long foreplay requires a powerful testosterone burst that burns continuously to charge the parasympathetic erection circuit. Otherwise, the erection will go limp or a man will ejaculate upon penetration or in a short time after few strokes.

Men who experience weak erections often rely on the tightening of the PC muscles in order to keep the erection alive. This puts added stress on the prostate gland and trains the PC muscles to contract, mimicking a state of orgasm that will open the ejaculation valve prematurely, allowing semen to leak. This contributes to premature ejaculation. Therefore, a firm erection is absolutely necessary when it comes to fighting premature ejaculation and seminal leaking.

However, to hold the erection up and tighten the ejaculation valve, you still need a basic resting potential in the parasympathetic sexual motoring nerve and a continuous burst and burning of testosterone to charge the nerves during sex. Testicular stimulation during intercourse can help the testosterone burst and burning to increase the penile power and combat seminal leakage that often contributes to premature ejaculation not to mention embarrassment in front of a sexual partner.