If this works, the now fertilized ovum sticks to the side of the uterus and the woman becomes pregnant. These include Humans, bonobos, In both humans and bonobos, the female has a relatively concealed ovulation.
Neither male or female partners commonly know whether she is fertile at any given moment.
There are other forms of sex that may also be against the law, such as incest, sex with minors, sex outside of a marriage, prostitution, homosexual sex, sex with animals, as well as others.
Sexual intercourse is the natural and most common way to make a baby.
In the case of humans, long-term partnership is more important than immediate sexual reproduction.
Humans, bonobos and dolphins show cooperative behaviour.
It is recommended that a couple who have a sexual relationship use two forms of contraception. Contraception allows people to keep "sex for fun" separate from "sex to make children".
Overall, such cooperation also benefits each member of the group in that they are better able to survive.
Two animals coming together for the purposes of sexual reproduction is called mating.
Most animals only mate when the female is at the point of estrus, which is the most fertile period of time in its reproductive cycle. Forcing someone to have sex who does not want to, called rape, is a serious crime in many countries.
People and animals that sexually reproduce use sexual intercourse to have an offspring.
Sometimes sexual intercourse is called coitus or copulation and is more casually known as having sex or sleeping together.