Answer:
Unrestricted sexual behavior.
Step-by-step explanation:
The option that is NOT one of the key features of family life or universal functions of families, is unrestricted sexual behavior. Family is a fundamental social institution that has many functions. In families, there is economic cooperation. One of the most important functions of families is to reproduce and socialize children. But, unrestricted sexual behavior is not a key feature of family life. On the contrary, families regulate the sexual behavior of their members.