he current research aimed to determine the relationship between marital happiness and knowledge of HIV/AIDS STDs with trends in infidelity. The sampling in this research employed the technique of purposive sampling, i.e, the characteristic of the subject has been determined by previous researchers – married male and female, aged 21 – 35 years old, live with their spouses and/or divorced. Data collection was conducted in two sites, Oesapa and Pasir Panjang, Kelapa Lima Subdictrict, Kupang Regency. Multiple regression analysis shows F value = 23,466 and p

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