Editing Infidelity (section)

===Sex-ratio theory===
[[Sex ratio]] theory is a theory that explains the relationship and sexual dynamics within different areas of the world based on the ratio of the number of marriage-aged men to marriage-aged women. According to this theory, an area has a high sex ratio when there is a higher number of marriage-aged women to marriage-aged men and an area has a low sex ratio when there are more marriage-aged men.<ref name="Schmitt, D. P. 2005"/> In terms of infidelity, the theory states that when sex ratios are high, men are more likely to be promiscuous and engage in sex outside of a committed relationship because the demand for men is higher and this type of behavior, desired by men, is more accepted. On the other hand, when sex ratios are low, promiscuity is less common because women are in demand and since they desire monogamy and commitment, in order for men to remain competitive in the pool of mates, they must respond to these desires. Support for this theory comes from evidence showing higher [[Divorce rates by country|divorce rates]] in countries with higher sex ratios and higher monogamy rates in countries with lower sex ratios.<ref name="Schmitt, D. P. 2005"/>