Data from a national cohort study of men and women bent in Britain in 1958
ape used to examine factors influencing the outcome of cohabiting first par
tnerships. Conception is found to be a key factor promoting marriage for bo
th men and women. Observed gender differences in the estimated impact of ch
ildren on partnership stability; are likely dui to the incomplete reporting
of past fertility among men. Social class and educational differentials in
the likelihood of female cohabiters experiencing a conception, and their l
ikelihood of subsequent marriage, suggest that the role of cohabitation var
ies according to socioeconomic background.