Zināʾ (زِنَاء) or zina (زِنًى or زِنًا) is an Islamic law concerning unlawful sexual relations between Muslims who are not married to one another through a Nikah. It includes extramarital sex and premarital sex, such as adultery (consensual sexual relations outside marriage), fornication (consensual sexual intercourse between two unmarried persons), and homosexuality (consensual sexual relations between same-sex partners).