I Need to Be Intellectually Stimulated

You will want to kill each other but you won't because you'll miss each other too much if you do.

You'll really start to understand each other more to some degree, farts and poop will definitely become normal, unless you guys are weird and are ashamed to do those things in your own house.

Maybe more/less sex depending on your premarital sex life. It really depends, could be anything honestly.