What men need to know: Five truths about sex! There are countless versions of male-female communication—and sex is the official one. Although this is a joke, it is not difficult to see how important sex is to men and women. Sex is very important. It not only satisfies the physiological needs of both men and women and brings physical pleasure, but it is actually the biggest function and the deepest reason: to pass on genes and reproduce children. And do you know some of the truth about sex?

Five truths about sex:

1Is it true that she cannot get pregnant during her period?

We have always been taught that you will not get pregnant if you kiss a girl or if she sits on the stool you sat on, but it is different during menstrual period. You have a chance to kill someone. First of all, not all bleeding conditions are menstrual periods. Sometimes women also bleed a small amount during ovulation, and it is very easy to get pregnant during this time. Secondly, if a woman’s menstrual period is very short, her ovulation period may be on the 7th day of her menstrual cycle, which is the 7th day when her menstruation begins. If her menstrual period lasts for 7 days, then the day when her menstrual period ends. It just so happened to be when she was ovulating. Dude, you are confused, so you might as well just wear a condom, it will be safer.

2Does eating oysters really have an aphrodisiac effect?

From an anatomical point of view, an oyster does look like a certain part that you are looking forward to, but this does not mean that it must have an aphrodisiac effect. There are also many other foods that are considered to have aphrodisiac properties. Although there is no specific documentation on their effectiveness, oysters are actually much more reliable than raw oysters. Oysters are rich in vitamins and minerals, especially zinc. It controls the concentration of progesterone in the body, which enhances libido. Other foods that are thought to increase desire include chocolate, strawberries, champagne and Spanish golden flies (only golden flies soaked in strange liquid, and only effective if eaten during the process)

3. Will the little brother really have a fracture?

Yes. Although there are no bones in the penis, it can still break, which is also known as penile fracture. Sudden injury or bending of it while it is erect may cause the fibrous protective layer surrounding its spongy body to break. This happens most often in casual encounters of passion. When this kind of injury occurs, don't expect to use a cast or crutches to solve it. You have to have surgery.

4Do underwear really affect fertility?

Everyone has their own preferences. For example, Clinton once said that he likes to wear boxer briefs. And Berlusconi likes sexy briefs. It was originally believed that wearing tight underwear would cause male infertility because tight underwear would increase the temperature of the testicles and interfere with sperm production. A recent study in the Journal of Urology showed that there was no significant difference in sperm count, sperm concentration and motility when men wore tight underwear and loose underwear. This is thanks to the scrotum, whose function is to maintain the temperature of the testicles. No matter what you wear or don't wear, it will stick to its job. So you can choose the underwear you like, and your sperm won't feel the difference at all.

5Will the sperm really run out?

A dry well is a terrible nightmare. Is it possible? While the answer is no, there is some bad news. From birth, women carry all the eggs they need for a lifetime, while men have to constantly make sperm, which sounds great. But researchers have found that after a man reaches the age of 35, sperm activity will become abnormal and DNA will be somewhat damaged. According to research by the WHO, the number of men's ejaculate at one time is now about 20 million, and the sperm motility rate is 50%. This is very different from 25 years ago, when the number of sperm could be as high as 100 million. So if you want to create humans, hurry up.