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Evolution is not an explanation for everything. Sometimes game theory is a better explanation.
Or if you understand the design parameters of the problem you are stating, you will realize the solution of "why things happen the way they do" is because it is the most efficient solution to the problem in terms of energy and growth.
Chastity causes good families to be formed, which is the basis of a high functioning society. It motivates men to work and create and succeed. Whoring around causes families to fall apart which demotivates men to work, and so society falls apart. The societies which are most successful need to produce good families, which requires high levels of chastity. Excess whoring around is a sign of a decadent society that is in decay.