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Abstract
Spouse-pairs are known to have similar alcohol behaviour, but this could be for several reasons; spouse-pairs may become more similar over time while cohabitating, individuals who frequent drinking establishments may be more likely to pair-up with similar individuals or other factors such as educational attainment may be assorted on and lead to spousal alcohol use correlation. We aimed to explore these possibilities using genetic variants which influence alcohol metabolism. Our findings of spousal correlations between genetic and phenotypic measures of alcohol consumption suggest that alcohol consumption directly influences mate choice.