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Juvenile jonathan star jacks off and eats his sperm

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There was a time when infertility was seen as a women's problem.

Older dads are more likely to pass on genetic mutations to their offspring Juvenile jonathan star jacks off and eats his sperm older mums, according to research. And studies show that male infertility is behind half of all cases where couples fail to conceive after one year.

Sperm counts in men worldwide have declined by half over the past 50 years and are continuing to fall. Here, in a piece for The Hippocratic Posta range of experts reveal 23 things that could be diminishing your partner's supply - and what can be done to prevent it. Scroll down for video.

Sperm counts in men worldwide have declined by more than half over the past 50 years. But there are plenty of ways that men can optimise their quantity and quality.

The average European sperm count is in the region of 70 million per millilitre. According to the World Health Organisation, a man needs a sperm count of at least 20 million sperm per millilitre of ejaculate to have a chance of conceiving a child without medical intervention.

Sperm, which are the swimming cells that carry a male's DNA, are continually produced in the testicles at the rate of up to million every day.

The process, which is controlled by the endocrine system under the influence of the male sex hormone, testosterone, takes about 60 days. It then takes a further 10 to 14 days for the Juvenile jonathan star jacks off and eats his sperm to pass through the epididymis, which is where they mature, before they can leave the body via ejaculation.

Fortunately, there are plenty of ways that men can optimise the quantity and quality of their sperm. Studies have shown that men's fertility starts to decline after the age of Men have a biological clock just like women. Studies have shown that men's fertility starts to decline after the age of 35 and female partners, regardless of their own age, have less chance of getting pregnant.

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One French study, published in published in the journal Fertility and Sterility infound that women younger than 30 years old was 25 per cent less likely to conceive a baby if her male partner was 40 years or older. A woman aged 35 to 37 years was 50 per cent less likely to conceive if the male partner was over 40 years old. Studies have shown that the genes contained in the sperm of older men have a greater chance of being abnormal.

A study at the University of California, Berkeley found that the sperm of older men were less mobile and less able to move in a straight line. Allan Pacey, professor of andrology at the University Juvenile jonathan star jacks off and eats his sperm Sheffield, says: You can't turn back the clock and the age of first time fathers in the UK is rising steadily to 32 compared to 27 in However, perhaps it is time for a rethink, according to Dr Pacey who points out that men over the age of 40 are advised against donating sperm.

Close-fitting underwear is going to hinder your chance of conceiving a child, as modeled by ex-footballer David Beckham, experts say. Male models — and footballer David Beckham — may look great in tight designer briefs, but close-fitting underwear is going to hinder your chance of conceiving a child. That's the conclusion of a large-scale study of men published in the journal Human Reproduction in June by researchers at the University of Sheffield and the University of Manchester.

Sperm counts in men worldwide...

Dr Allan Pacey, one of the lead researchers, explains: The reason is probably related to underwear pulling the testicles closer to the body, reducing air circulation and causing the temperature of inside the testes to rise. Testes that are too hot produce less sperm because the seminferous epithelium, which lines the tubules where cell division takes place, is sensitive to elevated temperatures.

It will take three months to bring fertility levels back to normal. Testicles that remain inside the body and have not come down into the scrotal sac will not be producing viable sperm stock. This is a common problem that occurs in per cent of full term infants but it usually resolves itself before a child is a year old.

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Occasionally, a male may reach adulthood with the problem still unresolved. Testicles that remain inside the body and have not come down into the scrotal sac will not be producing viable sperm. They are considered abnormal and are also more prone to becoming cancerous. If the testes does not descend on its own, surgeons may perform an operation called an orchiopexy to bring the testes down and stitch it in place within the scrotum.

Radiation and chemotherapy treatment for cancer can also impair sperm production. In particular, up to 70 per cent of men who have prostate cancer and have undergone a radical prostatectomy will not be able to maintain an erection after surgery, according to Cancer Research UK. Some chemotherapy drugs are more likely to lead to permanent infertility than others. The high-risk drugs most likely to affect reproductive organs are Cytoxan, Ifosfamide, Procarbazine, Busulfan, and Melphalan.

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Others, like vincristine and methotrexate, are typically less likely to harm fertility. Being ill can affect male fertility, but experts say further research is needed to determine why.