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Sex – Sexual Intercourse

Sex – sexual intercourse.

Coitus
Missionary position sexual intercourse (painting Édouard-Henri Avril) Sexual intercourse is for the participants of the evolutionary reasons, usually very pleasant. It is usually preceded by foreplay, which induce sexual arousal of the partners, causing an erection (erection) of the penis and natural lubrication (moisture) vagina. The erect penis is inserted into the vagina and one or both partners to stimulate further touches to achieve ejaculation and orgasm. From the perspective of fertilization female orgasm is not essential for egg fertilization is sufficient only to ejaculation in the vagina and then follow the successful combination of sperm and egg.

[Edit] PozicePodrobnější Main article: List of sex positions.
Sexual intercourse can be operated in various positions for normal fertilization is only important act of inserting the penis into the vagina and the successful culmination of the vagina. People for the diversification of sexual intercourse created a number of different sexual positions that are different physically demanding and require different positions of the two or more partners. Among the most popular positions include so-called “missionary position” when a woman lies on her back and the man is apparent in her face. This position allows deep penetration of the vagina, low physical demands and views of both partners to each other. Other positions include positions in the so-called hobby, which is a man on his back or sitting, a woman kneeling or sitting on it, or possibly if both partners are laid on the side (lateral position “teaspoon”). In addition to these positions, there are many others that are described for example in the Indian Kama Sutra.

[Edit] Other forms of contact may have stykuSexuální or more broadly to include other forms, including pregenitálních and negenitálních: social and emotional convergence, petting negenitální forms (see, petting, necking, kiss), as well as oral, manual or instrumental irritation of the genital or penile -anal intercourse. Some of these activities are gaining in importance in the relations between persons of the same sex, particularly gay-oriented, including classic coitus usually is not possible. Some of these activities are often generally viewed only as preliminary, supplementary or replacement.

[Edit] Biology početíKoitus is the basic reproductive method of Homo sapiens, as well as mammals. During ejaculation, which usually accompanies male orgasm, a series of muscular contractions (contractions) delivers semen containing male gametes known as sperm cells or sperm into the vagina. Follows the path of sperm from the vagina through the cervix (cervix) into the uterus and then into the fallopian tubes. Sperm cells can survive in a woman’s body 2-3 days, according to some authors and more.  When a fertile woman’s egg is in the fallopian tubes, the sperm into the ovum resulting in fertilization (fertilization) and the formation of a new embryo . When the fertilized egg reaches the uterus, implanted in the uterine lining known as endometrium and a pregnancy begins.

For both parties to the sexual intercourse is appropriate to consider that their activity is very likely to cause pregnancy, unless any adequate means of contraception. But even then it is necessary to admit the possibility of pregnancy, because no contraception is 100% effective. The withdrawal (coitus interruptus), or “pull” of the penis from the vagina before ejaculation as an effective method of contraception can be considered and can not recommend it. The only completely reliable method of working to avoid pregnancy is abstinence, and sterilization. External relations, that is sexual activity without insertion of the penis into the vagina, can be performed without risk of pregnancy, provided that the sperm comes into contact with the vulva (external female reproductive tract).

[Edit] Problems with stykemMnoho men at least occasionally a problem called erectile dysfunction or impotence. Some men also have an orgasm during intercourse dysfunction called anorgasmia. Anorgasmia is far more common in women, its solution usually requires the attention of both partners over time. Many, especially younger women and women with relatively little sexual experience difficulty achieving orgasm or not at all capable of it. Vaginismus is an involuntary spasm of the pelvic floor muscle (vagina muscle), doing coitus stressful or impossible. Dyspareunia is painful or uncomfortable intercourse and may be due to many causes.

[Edit] Sexually transmitted nemociHlavní article: Sexually transmitted disease

Sexual intercourse as other sexual activities, which include the possibility of transmission of bodily fluids, it also means the spread of sexually transmitted diseases (STDs). According to the Centers for Disease Control and Prevention “The surest way to avoid transmission of sexually transmitted diseases is to refrain from sexual intercourse at all, or be in a stable mutually monogamous relationship with a partner who has been tested and you know it is not infected. For persons whose sexual behavior puts them at risk of infection, correct and consistent use of male latex condom can reduce the risk of infection. “

[Edit] Ethics and zákonPohlavní intercourse is associated with various laws and ethical rules. Article contains details of sexual morality.

In some societies it is considered the only “acceptable” sexual activity, coitus, or only activities directly aimed at reproduction. Relatively strict determining what is “reasonable” and “inappropriate” sexual intercourse have identified almost all human societies. This determination may include, for example the prohibition of certain specific positions, against intercourse among partners without officially recognized union (marriage) or marriage, but not in each other (adultery), the prohibition of sexual intercourse with close relatives (incest) and to prohibit intercourse during menstruation women. Some companies for example, but instead allowed for the recognition of homosexuality or sex as a way to worship deities (temple prostitution).

Most countries have age of consent – or the minimum legal age for sexual intercourse.

Sexual intercourse with a person against her will is called rape and is considered a serious crime in most cultures. Some cultures, but not for rape, forced intercourse in marriage.

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