In humans, sexual intercourse seems to serve three types of purposes,which do not exclude one another: In the late 20th century, very effective forms of contraception (birth control) were developed allowing a man and women to help prevent a baby from being made when they have sex. This is a piece of rubber that covers the penis that a man can wear during intercourse, which stops the man's semen from going into the woman's vagina.
This does not always work though because the condom may rip or tear.
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In many cases, this behaviour has shown better results than what an individual can achieve alone.
In these animals, the use of sex has evolved beyond reproduction and has taken additional social functions.
In the case of humans, long-term partnership is more important than immediate sexual reproduction.
Humans, bonobos and dolphins show cooperative behaviour.
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