Sexual reproduction is a type of life cycle where generations alternate between cells with a single set of chromosomes and cells with a double set of chromosomes. Sexual reproduction is by far the most common life cycle in eukaryotes, for example animals and plants.
First, sexual reproduction can combine the effects of two beneficial mutations in the same individual (i.e. sex aids in the spread of advantageous traits). Also, the necessary mutations do not have to have occurred one after another in a single line of descendants. [unreliable source?
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The sex organs or genitals are used for sexual reproduction and for sexual intercourse. For sexual reproduction to happen, a man and a woman need to have sexual intercourse with each other. A man's penis becomes erect when he is aroused, for example when he sees a .