How to judge the safety period? is the safety period contraception scientific?

Many female friends around them often use safe period, in vitro ejaculation and other methods as contraceptives. The contraceptive results of these two methods are not very satisfactory. Because of the uncertainty of each woman's menstrual cycle and ovulation period, it is even more difficult to judge the real "safe period".
How to calculate the safety period
The method of calculating ovulation period according to menstrual cycle is also called calendar method. Menstruation and ovulation are affected by the endocrine hormones of the pituitary gland and ovary and show periodic changes, the length of the two cycles is the same, is one cycle per month, and ovulation occurs in the middle of two menstruation. Women's menstrual cycle is long and short, but the interval between the ovulation day and the beginning of the next menstruation is relatively fixed, usually about 14 days. According to the relationship between ovulation and menstruation, the ovulation period can be calculated according to the menstrual cycle. The calculation method is from the first day of the next menstruation, the last 14 days or minus 14 days is the ovulation day, and the ovulation day and its 5 days before and 4 days after ovulation are called ovulation period. This is the theoretical basis of safe period contraception. For example, if a woman's menstrual cycle is 28 days, and the first day of this menstrual cycle is December 2, then the next menstrual cycle is on December 30 (December 2 plus 28 days), and 14 days are subtracted from December 30, then December 16 is the day of ovulation. Ovulation day and its first 5 days and 4 days later, that is, December 11-20 is the ovulation period. Except for menstruation and ovulation, the rest of the time is a safe period, that is, the so-called "seven up and eight down". During the safe period of sexual intercourse, there is no need to use any contraceptives and contraceptives.
Using this method to calculate the ovulation period double dildo , we must first know the length of the menstrual cycle before we can calculate the start date and ovulation period of the next menstrual cycle, so it can only be applied to women whose menstrual cycle has always been normal. For women with irregular menstrual cycles, it is impossible to calculate the date of their next menstruation. Therefore, it is impossible to calculate the ovulation date and ovulation period.
It is easy to fail to use calendar method for contraception. Because some women sometimes postpone or advance ovulation due to health conditions, environmental changes and mood swings, the ovulation period calculated according to the menstrual cycle is not correct. According to foreign statistics, the failure rate of using calendar contraception is 14.4%-47%. Therefore, this method is only suitable for people who have a normal menstrual cycle, live together for a long time, and can correctly master the safe period. It is unreliable to use this method for people with irregular menstrual cycle, couples during family visits and women whose living environment has changed.
How to judge the safety period?
Visual cervical mucus
Women due to mature follicles can produce more estrogen, when to a certain extent, that is, during ovulation, can make cervical glands secrete more mucus, about 3 to 30 times the usual, when the mucus hail transparent, sticky small, watery, easy to pull into a filamentous. It can be up to 15 to 20 centimeters long. If under the microscope, it can be seen that the cervical mucus shows a crystal in the shape of fern leaves, and at the same time, the woman can touch the cervix, and it can be seen that the outer mouth of the cervix spreads outward during the ovulation period, and the original cartilage-like hard cervix becomes soft. and in a large number of clear, smooth, elastic mucus flow to the vagina, contraction of the vagina to make mucus discharge out of the vagina. It can be seen that the mucus is smooth and transparent, and the mucus can be pulled into a filament with the thumb and index finger, up to more than 10 centimeters. Be careful not to confuse the semen left after the room with this mucus. The closer you get to ovulation, the more smooth, clear and watery the mucus becomes. If once found that vaginal secretions increase, that is, the increase of cervical mucus, immediately avoid sharing a room or the use of condoms and other measures, and pay attention to the changes of mucus, until the cervical mucus becomes smaller, mucus thickens and dries, about 5-7 days. It is best to record the date on which the increase or change of mucus is found every month in order to explore its rule.
2. Take basic body temperature
The body temperature of women can change with the menstrual cycle, with lower body temperature during menstruation and follicular phase penis cage , and higher in luteal phase. It is more than 36.8 ℃ in the first half of menstruation, which is caused by the secretion of progesterone in the body. To predict the ovulation period, it is necessary to draw a basic body temperature curve. Some small square paper can be used to mark the temperature scale equidistant on the vertical axis of the square, starting from 36 ℃, 0.1 ℃ as the grid, to 37.5 ℃, a total of 15 frames. Mark the first, second and third of the menstrual cycle on the horizontal axis of each grid. The number of days, menstruation is marked by X. On the first day of menstruation, after waking up every morning, put the thermometer under the mouth and tongue before getting up, measure it for five minutes, and mark the reading on the horizontal and vertical coordinates on the checkered paper, indicated by black dots. There are also people who urinate after getting up every morning, then measure their urine temperature, and also record their urine temperature readings on checkered paper, both of which are fine. Note that after each temperature measurement chastity sissy , the thermometer should be thrown below 36 ℃ for next use. Then, the temperature black dots recorded daily on the checkered paper are connected into a curve. In general, the body temperature curve of normal women began to change little, and the body temperature increased significantly in the middle stage. According to Jacquis and others abroad, 95% of women's hypothermia occurs within 66 hours before ovulation, of which 70.4% occurs 48 hours before ovulation, and the average ovulation time occurs 33 hours after the hypothermia point. Therefore, once there is a low temperature, it is necessary to avoid sleeping together or take other methods of contraception. It is generally believed that the accuracy is 80%.
Third, measure saliva resistance
In recent years, it has been found that changes in female hormones can cause changes in electrolytes in saliva before and after ovulation. As a result, the resistance value can be changed periodically. So some people use this principle to measure resistance to predict ovulation. The method is: before waking up every morning, spit out some saliva in a container, measure it with a resistor or multimeter huge dildo , keep a certain distance between the two measuring rods, and record the values obtained day by day after measuring the resistance. draw a curve like taking body temperature. After one cycle, it can be found that after the fifth day of the menstrual cycle, the resistance value can appear the first peak, and after three consecutive days of low value, there can be a second peak: ovulation often occurs during the period of 6-9 days after the first peak, so attention should be paid to abstinence or the use of condoms on the 4th-10th day when the resistance reaches the first peak. By the same token, some people abroad have measured the resistance of the posterior vaginal fornix and found that the lowest day of the monthly vaginal resistance is a signal that ovulation is about to occur. The combination of the two methods is more accurate.
Realistic dildo | best vibrator | pvc dildo | fat pocket pussy | Mushroom Head Dildo | Penis Pumps

• How to judge male sexual dysfunction
• How to judge whether a woman has kidney deficiency? Six signs tell you