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Perhaps many people who already know where it came from sperm and its function in the process of egg fertilization. However, sperm actually still have a lot of interesting secrets that have not been revealed. Dr. David Shin, head of the Center for Sexual Health & Fertility of Hackensack University Medical Center, United States, to share information about the 13 facts about sperm, which are as follows:

1. Sperm is produced in the testes and it took 10 weeks to mature.

2. Mature sperm can wait up to 2 weeks in the "waiting room" called the epididymis before they debuted. The epididymis is a circular channel located at the very top and back of the testis. Its function is to channel sperm.

3. Sperm only contributes 5 percent of the total volume of seminal fluid. The rest consists of a liquid medium which provides nutrients and protection of sperm so he could travel to the female reproductive tract.

4. Healthy men produce 70-150 million sperm every day.

5. Sperm can live up to 5 days in the womb. This explains why someone can get pregnant a few days after ovulation (release of egg cells).

6. Y sperm, which would produce a baby boy, swim faster than X sperm, which will produce a baby girl. Y chromosome is smaller and has less genetic material than X chromosome

7. Human sperm measuring about 55 microns. In comparison, approximately the size of a human hair is 100 microns.

8. Sperm comes from the Greek, meaning "seed".

9. Sperm can only swim forward, not backward.

10. Normal sperm has a head, bit the middle, and tail. Abnormal sperm could have two heads or two tails.

11. In the United States, men in New York has a sperm count 50 percent more than men in Los Angeles.

12. Linger in the sauna or hot bath can reduce sperm count.

13. Lubricants, lotions, and saliva can cause reduced sperm movement.

The presence of social networking sites like Facebook, Friendster, or Twitter to some extent has changed the behavior and lifestyle of most people.

Remarkable influence of the virtual world of social networking has also been pervasive in the personal lives of its users, including behaviors associated with others.

According to a recent study initiated by Mens Health magazine in the United States, network up-which is currently the most widely accessed sites, have changed many aspects of behavior, particularly related to how a relationship with a partner.

There are many interesting findings from the survey of about 3,000 this user. A total of 1377 men and 1540 women become targets in this study. Here are some important findings from this research:

1. Not honest in status
As many as 24 percent facebookers not put their relationship status to be honest. That way, they are more like 'options open' on the possibility of cheating or continue flirting with other people. Noted, as much as 27 percent of users do not install the status of relationship at all, and half of them are still single.

2. Means "Flirting"
About 70 percent of users claimed to use up to seduce or seductive friend. As many as 24 percent of the tempter is using social networking to seduce others rather than partners.

3. Burning jealous
As many as 59 percent of users admitted often jealous because their partners relate to others on Facebook. The results Amy Muise PhD from the University of Guelph indicated, up to contribute trigger jealousy, even in people who actually do not have the inclination or the nature of jealousy.

4. Disaster "wall post"
Some 29 percent of users said that posts a message on the wall (wall) or photo can cause problems with your partner. As many as 42 percent said they received complaints from spouses, and 11 percent of those surveyed put their partner in a limited profile so are unable to access or view all the activities she had done in up (either on the wall posts, comments, or photos).

5. Choose friends who draw
As many as 55 percent facebookers send friend request to someone they find interesting and important. As many as 23 percent send friend request to strangers, but to look attractive.

6. Find ex-lover
As many as 85 percent of users search and browse the ex-girlfriend through Facebook. Approximately 17 percent of their ex-girlfriend is always checking the page, at least once a week.

7. Stalking a former girlfriend or boyfriend
As many as 59 percent facebookers always "lurking" profile partner or ex-lover, looking for clues about their relationship with others. Are you also including scouts?

8. Long love blossomed again
As many as 32 percent of women trying to reestablish a relationship with her boyfriend on Facebook. Approximately 16 percent of these women are in a relationship status with someone. What about men? Approximately 36 percent of men trying to reestablish with her ex through Facebook; 1 in 5 men claimed to have been in a relationship. Meanwhile, about 3 percent of respondents to end his relationship with canceling relationship status via Facebook.

9. Break into the account pair
There are 23 percent of respondents who claimed to have hacked the break or partner account on Facebook. As many as 18 percent of respondents claimed to know the password mate, about 85 percent said they were told their passwords, 16 percent to guess his password, and 9 percent of respondents deliberately hacked the account up mate.

10. Event affair
As many as 5 percent of respondents admitted having an affair with someone else. How could they pass up an affair? The respondents gave several reasons:

- "I'm bored with the relationship over the years. Seduction, seduction is on Facebook provoke me for cheating."

- "I never met even slept with two men who I know on Facebook."

- "Yes, I had an affair with someone I met on Facebook (friend me is cheating mutual friend and another close friend)."

- "I made plans to meet via a message on Facebook."

- "There's a man I have ever known over the years. While I was dating other people when it just as he did, we still frequent contacts through Facebook, such as designing a meeting, express their feelings for each other, and so on."

- "I use a private message to design a meeting with the former."

Age does not seem to be a barrier for a man to have sex. The results showed, elderly man was still excited to have sex, but they are often hampered disease problems and few opportunities to do so.

Research conducted in Australia states, men aged over 75 years are still active in sexual intercourse. Interestingly, 1 out of 10 in this elderly age 90 to 95 years.

The hormone testosterone is clearly related to how often men over 75 years is having sex, and experts should continue to do research if hormone replacement therapy can provide benefits for elderly men.

Zoe Hyde of the University of Western Australia and colleagues involving 2700 men aged 75-95 years in their study. Respondents were interviewed about health, personal relationships, and sexual activity. The results of this research published in the Annals of Internal Medicine.

"Older men are no longer had sexual activity that burns, but sex is still very important for one-fifth of men aged 90-95 years. The results of this study contradicts the stereotype that says that the older the person, the more will no longer have sexual desire."

"For those who are sexual active, more than 40 percent were dissatisfied with the frequency and want sex as much as possible," said the research report.

More than 30 percent of men reported sexual activity in the past year, but more than 48 percent stated that sex is still important. This indicates that they still want nge-sex, but can not do it because of various reasons. Age is one factor, in addition to other causes, such as testosterone levels, a couple who was interested, diabetes, and prostate cancer.