Question: Why is it difficult to determine whether there is a trend with regard to marriage and cohabitation for same-sex couples in the U.S.? Group of answer choices What is legally considered as marriage for same-sex couples varies by state. Civil union and domestic partnership laws do not exist for same-sex couples. The number of same-sex cohabiting partners and married couples has not changed. Same-sex couples do not want to share their marital status with other people.