Sperm donors up to the age of 45 are just as likely to conceive children as those in their 20s, a large study has shown. By encouraging more men to come forward as donors, they could help alleviate the sperm shortage faced by fertility clinics. But researchers warned that older men in the general population should not assume they are also as fertile as their younger peers. This is because all men who get through the stringent donor screening process, almost by definition, have high quality sperm.
Physiology of the Male Reproductive System
Male Sexual Response
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The penis grows enlarged and firm, the skin of the scrotum is pulled tighter, and the testes are pulled up against the body. As sexual arousal and stimulation continues, the glans of the erect penis will swell wider. As the testes continue to rise, a feeling of warmth may develop around them and the perineum. With further sexual stimulation, the heart rate increases, blood pressure rises, and breathing becomes more rapid. The increase in blood flow in the genitals and other regions may lead, in some men, to a sex flush. The muscles of the pelvic floor, the ductus deferens between the testes and the prostate , the seminal vesicles, and the prostate gland may begin to contract in a way that forces sperm and semen into the urethra inside the penis. This is the onset of orgasm and once this has started, the man likely will continue to ejaculate and orgasm fully, with or without further stimulation. If sexual stimulation stops before orgasm, the physical effects of the stimulation, including the vasocongestion, will subside in a short time. The relationship between erection and arousal is not one-to-one.