Eggs can select semen

According to the latest research, female's eggs are able to select sperm with the best genes to ensure the healthiest offspring. Semen does not appear to have the same ability to detect bad genes, this shows that fertilisation is not random and specific pairings between certain eggs and sperm are more common than others. Researchers bred female mice carrying one normal and one mutant copy of a gene that increased the chance of getting testicular cancer.

 The resulting offspring followed Mendel's rules and there was a random dispersal of the mutated form among offspring. Researchers reversed the breeding- gave males the mutant copy of the cancer gene while the females had the normal version. Only 27 per cent of the offspring had the mutant variant, compared to the 75 per cent. Researchers found no evidence the mutated mice embryos were dying shortly after fertilisation, rather they were never fertilised.

The rate of metabolism folic acid - which is an important signalling molecule - is different in sperm and eggs. Research has revealed that these molecules play an important role in fertilisation. Changes in these signals may impact how much sperm and egg are attracted to one another. When sperm from multiple males arrive at an egg concurrently, eggs are able to choose the sperm whose recognition proteins are best suited for healthy fertilization. This selection process can spur the evolution of new recognition proteins, eventually resulting in reproductive isolation and, in some cases, the creation of new species altogether.
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Age and diseases may be responsible for curve penis

According to a doctor, the penis can become curve naturally as a man gets older, it can be a sign of a serious disease which has recently been linked to cancer. Some men have a more bent penis for a harmless reason-the two tubes that fill with blood to give an erection can be different sizes. The skin on the organ can affect how curved it appears, aging makes skin gets looser, the curve can look more pronounced.

But a bent penis can be a symptom of a condition known as Peyronie's disease, which is estimated to affect up to seven percent of males. Researchers recently linked this with a higher risk of various cancers-including testicular, melanoma and stomach. Signs of  Peyronie's include scar tissue, a significant bend, erection problems and pain.

When the penis becomes erect, it's because two tubes called the corpora cavernosa fill up with blood,
the resultant curve may not be too noticeable when a man is flaccid but become more obvious when he is hard. As we all age, the skin all over our body produces less collagen and as a result, the skin becomes thinner and more fragile and starts to sag. So the natural curve can be more prominent as the skin hangs down looser.

Peyronie's disease occurs when a scar formation in penis prevents straight erection. It can make sex painful and cause erectile dysfunction. But in many cases men have no recollection of a specific trauma. In some, Peyronie's comes on gradually and doesn't seem to be related to an injury. Researchers therefore suspect it can be related to genes. In some men, injury and genetics could both be involved.

A recent study of different men found Peyronie's disease brought a higher risk of testicular cancer by 40 percent, melanoma by 29 percent and stomach cancer by 40 percent. A gene that may trigger the complaint could also be linked to the development of tumors.
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Watercress boosts sperm counts

Watercress is a good source of vitamins B1, B2, B6, C, E, manganese, and carotenes. It is also a good source of calcium, fiber, iron and copper.

Watercress reduces stress, prevents pressure, tension and maintains the sperm count in men. Poor diet and obesity contribute to the drop in sperm levels, eating watercress regularly can destroy the effects of stress on sperm counts.

It is a good source of age-defying antioxidants that may prevent or slow the oxidative stress induced by free radical damage.

Regular intake of watercress increases counts and quality of sperm. It also prevents DNA damage that can lead to testicular cancer.

Apart from watercress these foods can also boost sperm counts - Banana, Walnut, Egg, Spinach, Dark chocolate, Asparagus, Broccoli, Pomegranate, Oyster, Garlic and Beans.
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