At One Point in Time, It Was Assumed to Be

At one point in time, it was assumed to be natural that people who loved each other got married, that sexual love bound men and women permanently to one another, and that heterosexual married lovers would have children. Contemporary debates surrounding gay marriage, however, are an example of what social process?

A) Denaturalization
B) Perversion
C) Declining family values
D) Postmodern revolution
E) All of the above