An elaboration on the Hindu and Buddhist concept of karma (the way we act or perform brings upon us inevitable results in this life and the next) but in reference to the vivacity and health of our sexual encounters and love life. Simply put, we reap what we sow (in bed).
Example 1: I accidentally bit Fidel's junk while going down on him last week, and then yesterday he tore up my vag with his braces. karma sutra.
Example 2: I spent all week avoiding Raul and making excuses as to why I couldn't hang out. I guess it's karma sutra that Ernesto's now totally doing the same to me.