In a simple English,see common things that make you infertile or even sterile as a man. Most of it are caused by you.
1)BLUETOOTH DEVICES: many men are fond of making calls or listening to musics via bluetooth. This is dangerous as many sperms would be killed by this ray and your sperm count can be greatly reduced as a result, especially when the phone is in your pocket trouser.
2)EXCESSIVE CYCLING- excessive bicycling is dangerous. This is due to the fact that the repeated upward-downward movement of the leg on the pedal can strain the spermatic duct and could lead to poor erection.
3)WEARING OF TIGHTENED BOXER- The main reason why the testes is located outside the body is to enable it have a cooler temperature. Therefore,wearing a tight boxer could push the testes and cause them to be moved upward closer to the body which is always at a higher temperature. This temperature is not favourable to the testes and it can lead to poor sperm production and would subsequently lead to death of many spermatozoa.
4)LAPTOPS: This can cause low sperm counts. Puting laptops on your laps during operation can lead to increase in temperature and deaths of many sperms. Ensure you Put you laptop on the table not on your laps.
5)TYPE OF PROFESSION: There are some jobs that requires excessive sitting. When a man sits down for long, there would be an increase in temperature in your trousers as a result of excessive contact between it and the chair. As usual, this can affect sperm production.
In one word, exposure of the testes to heat (eg A MAN COVERING HIMSELF WITH THICK BLANKET WHILE SLEEPING, SITTING TOO CLOSE TO FIRE OR HEAT eg a man who engages in business like suya making,akara baking,some metal manufacturing companies,and also sitting close to a cooker while cookingis equally dangerous) would adversely affect sperm production.
6)MASTURBATION- a man who engages in sex with his wife after just masturbating may not produce enough sperm to make a baby because most of the sperm are already ejected out making the semen not active enough. Such men has to wait for some hours(depending on how much he masturbated) to enable the lost sperm to be replenished.
7)SUGARY FOOD- This may affect proper erection if it is being consumed excessively.
ALCOHOL,SMOKING,DRUGS- This can equally affect men's fertility.
9) INJURY TO THE TESTES- Many athletes like footballer etc often wear a protective cap on their scrotum. This is to reduce the gravity of damage that could be done to the testes if hit. The testes is highly sensitive.. So if you were hit down there, run quickly to the doctor whether you experience great pain or not. If proper and emergency treatment is not given, the testis may die in some case within 30 munites and this may force the affected testis to be removed leaving you with only one testis. This could lead to sterility if both testes were involved. Therefore,go to the doctor if you experience any slight pain,swolleness in your balls.
10) HEREDITARY FACTOR- Hmm...Some men has problem in given birth due to genetics. Such men need to see a doctor for proper check up counselling.

Ladies during courtship should caution their boyfriends of some of these bad habit of theirs. Most of these habits may have caused serious havoc especially if it had been developed from early childhood.

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Bluetooth kwa?

@OP, if your no.2 was correct, I would have been born.

Op you try oo...buh dat no4 eeh...(wer dem d YAHOO guys? 8-)

All these? Chai, men don suffer.

Hmmmm