The term body count refers to the number of individuals with whom a person has had a sexual relationship.
On the other hand, Body rotation refers to the number of partners that an individual is having sexual relationships with at the same period.
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A good example is when a man or a woman is sleeping with more than one person within the same week either casually or even if he or she is dating all of them.
Similarly, if a man is sleeping with three women in a week, it can be said that he is having three women in rotation.