RT Article T1 Marital coital frequency and the passage of time: estimating the separate effects of spouses ages and marital duration, birth and marriage cohorts, and period influences JF American sociological review VO 50 IS 2 SP 224 OP 241 A1 Jasso, Guillermina LA English YR 1985 UL https://krimdok.uni-tuebingen.de/Record/1642387053 K1 Sexualverhalten