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Premature ejaculation is characterized by a lack of voluntary control over ejaculation. Many men occasionally ejaculate sooner than they or their partner would like during sexual activities. PE is a frustrating problem that can reduce the enjoyment of sex, harm relationships and affect quality of life. Occasional instances of PE might not be cause for concern. However, when the problem occurs frequently and causes distress to the man or his partner, treatment may be of benefit.   Although the exact cause of premature ejaculation (PE) is not known, new studies suggest that serotonin, a natural substance produced by nerves, is important. A breakdown of the actions of serotonin in the brain may be a cause. Studies have found that high amounts of serotonin in the brain slow the time to ejaculation while low amounts of serotonin can produce a condition like PE. Psychological factors also commonly contribute to PE. Temporary depression, stress, unrealistic expectations about perfor...

Frequent masturbation in young men is linked to higher risk of early prostate cancer , but it lowers prostate cancer risk for men in their 50s, a study shows. High levels of male sex hormones, or androgens, may increase a man's risk of prostate cancer . But different studies of this question, done in different ways, have reached different conclusions. To look at the question in a new way, a team of researchers  looked at whether men with more intense sex drives were at higher risk of prostate cancer.  About half the men got prostate cancer by age 60, and about half did not have cancer . The findings were surprising. Sexual intercourse did not affect prostate cancer risk. But frequent masturbation did -- in different ways, at different times of life. "Frequent masturbation during men's 20s and 30s increased their risk of prostate cancer. For men in their 20s, "frequent masturbation" was two to seven times per week. Compared to same-age men who reported mas...

    As the infant grows however, particularly as he learns to discriminate between himself and the outside world, the second structure of the personality, referred to as ego develops. The ego is the only rational element of the personality. It will soon exhaust itself and so it has to be policed. The ego obeys the reality principle which requires it to test image for their reality and to delay discharge of tension until the appropriate environment conditions are found. Ego is the locus of defense mechanism and as such it works out to compromise between the demands of pressure of environment and that of superego. The ego acts with intelligence and determines what demands will be satisfied and how they will be satisfied. The ego delays gratification so as to find out the reason behind the action. There is however no disparity between the goals of ego and superego.     The superego emerges during the period of four to six years. If the ego represents the executive ...

     The umbilical cord is a life support system, containing two arteries and one vein that connects the baby to the placenta. Very small molecules oxygen, water, salt, food from the mother's blood. It is necessary to note that large molecules cannot pass through the placental wall, these include red blood cells and harmful substances, such as most bacteria, material wastes, and hormones. The mechanisms that govern the transfer of substances across the placental barrier are complex.     The amnion, a bag or an envelope that contains a clear fluid, in which the developing embryo floats, is another important life support system. Like the placenta and umbilical cord, the amnion develops from the fertilized egg, not from the mother's own body. At approximately 15 weeks, the Kidneys of the foetus begin to produce urine. This fetal urine remains the source of the amniotic fluid until the third trimester, when some of the fluid is excreted from the lungs of growing ...

    Menstruation is a monthly sloughing off of the lining of the underutilized womb. Menstruation has different meanings in different societies while it has different significance for different women. But most society share the view that mensuration is a sign of sexual maturity although it does not necessarily indicate reproductive maturity.     Some girls readily accept the first menstrual period. They are joyful and excited while others are ashamed. This indicates how well girls are prepared for menarche, in terms of both information and attitudes. In recent times, menarche has been occurring earlier than attitude. Girls first menarche is in between 12 years.     Many researches have been carried out in recent years to determine the psychological effects of the marked fluctuations of hormonal levels that are connected to the menstrual cycle. One of the research says that most women experience depression, irritability, anxiety, and low self esteem duri...

   This is the ability to speak more than one language at a time. The first is simultaneous learning of two languages which happens when the language used at home is different from the one used in the community or at school. The other type is sequential or successive. This happens when a child has one established language before learning a second language, whether in preschool or later. Some children and adults, usually learn a second language through school or language classes.     Proactive inhibition occurs when a language that was learnt previously, interfere with the language presently being learned. Retroactive interference on the other hand occurs when what we are learning actively interfere with what we have learnt before. In the case of retroactive inhibition, some people cannot make a sentence in their mother tongue without bringing in another language like English language. It affects the concept in the child's learning strongly. Multiplicity of languag...