Growth curves for relationship quality over the first 10 years of cohabitation, controlling for separation, were estimated on the basis of survey data obtained over part or all of this time interval. Participants were both partners from 95 lesbian, 92 gay male, and 226 heterosexual couples living without children, and both partners from 312 heterosexual couples living with children. Relative to other partners, those from lesbian couples showed the highest levels of relationship quality averaged over all assessments. Pattern of change in relationship quality varied by type of couple. Partners from lesbian and gay male couples showed no change, those from heterosexual couples without children showed an early phase of accelerated decline followed by a leveling off, and those from heterosexual couples with children showed an early phase of accelerated decline followed by a 2nd phase of accelerated decline.
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