Changes in sexual decisions has led to offered attacks out-of numerous serial or concurrent relationships. This study examined the results away from several heterosexual couples to the mental wellness, specifically, whether high amounts of partners was connected with later on anxiety, anxiety, and you will substance dependence. Study in the Dunedin Multidisciplinary Health and Creativity Data, a prospective, longitudinal study of a delivery cohort created from inside the 1972-1973 in Dunedin, The fresh Zealand were used. The relationship between variety of gender lovers more around three many years attacks (18-20, 21-twenty-five, and you can twenty-six-thirty-two age) and you will diagnoses out of nervousness, depression, and material reliance sickness from the 21, twenty six, and you will thirty two many years were examined, having fun with logistic regression. Interaction from the intercourse is actually checked. Modifications is made for prior psychological state updates. There was no significant organization anywhere between amount of intercourse partners and later on stress and depression. Increasing numbers of intercourse people have been with the increasing threat of substance reliance diseases at all around three age. The latest connection was stronger for women and you may remained once adjusting to possess earlier in the day diseases. For ladies reporting dos.5 or maybe more lovers a year, versus 0-1 people, the newest modified strange ratios (and you will 95 % CIs) was indeed nine.six (4.4-20.9), seven.step 3 (2.5-21.3), and you can 17.5 (step three.5-88.1) from the 21, 26, and you may thirty two years, correspondingly.