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Coitus and conception are the initial stages that occur in humans that allow for the establishment of pregnancy. In order for coitus to occur humans need to be sexually aroused. Sexual arousal is then followed by a series of phases. These phases are:.
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An inside view of sex: MRI scanner captures intercourse as you’ve never seen it before
Magnetic resonance imaging of male and female genitals during coitus and female sexual arousal
Sexual intercourse , also called coitus , or copulation , reproductive act in which the male reproductive organ in humans and other higher animals enters the female reproductive tract. If the reproductive act is complete, sperm cells are passed from the male body into the female, in the process fertilizing the female egg and forming a new organism. In some vertebrates, such as fish , eggs are laid outside of the body and fertilized externally. To accomplish internal copulation certain body and organic adaptations are necessary. In the human male, the penis serves both excretory and reproductive functions.
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Sexual intercourse or coitus or copulation is sexual activity typically involving the insertion and thrusting of the penis into the vagina for sexual pleasure , reproduction , or both. There are different views on what constitutes sexual intercourse or other sexual activity , which can impact on views on sexual health. Various jurisdictions place restrictions on certain sexual acts, such as incest , sexual activity with minors , prostitution , rape , zoophilia , sodomy , premarital and extramarital sex. Religious beliefs also play a role in personal decisions about sexual intercourse or other sexual activity, such as decisions about virginity ,   or legal and public policy matters. Religious views on sexuality vary significantly between different religions and sects of the same religion, though there are common themes, such as prohibition of adultery.