When do you decide to move in together with your significant other?

When do you decide to move in together with your significant other?

While in a serious relationship?
After marriage? 
During engagement?

Do they leave the laundry around the house?
Are they clean or messy?
Who is going to cook?
Do we eat differently?
Who likes it quiet or who likes it loud? Who has company more?
Who talks on the phone too much? Female shed hair all around the house!
Leave the floor wet after showering. bathing? 
Your partner may smoke the smoke may irritate you! 
Snoring may be a factor? 
Leaving TV on while sleep?
Complain too much about around the house?
May play video games too much? 

Possibly share deep emotions together in a positive way?
Learn each other more? 
Connect on a level beyond means in a positive way? 
You may love catering to your significant other?
You get to practice every day loving one another?
Waking up to someone you really care about?