A brief theology of kink #3: what is sexual intimacy for?
Before we can ask about the permissibility of any given sex act, we need to know what criteria to judge it against. I identify three main ones, representing goals for sexual intimacy within marriage: (1) release; (2) enjoyment; (3) onetogetherness.
A brief theology of kink #1: what does the Bible command?
The Bible gives very few commands about what sex acts are permissible for married couples. Its concern seems to be not for regulating the nature of sexual intimacy, but rather for ensuring that it occurs with the right person. What couples may do is thus left for them to discern.