
This kind of sex happens when you first meet someone, and you both have sex until you are blue in the face.

This is when you have been with your partner for a short time and you are so horny you will have sex anywhere, even in the kitchen.
This is when you have been with your partner for a long time. Your sex has gotten routine and you usually have sex only in your bedroom.
This is when you have been with your partner for too long. When you pass each other in the hallway you both say "screw you".
This is when you get Nun in the morning, Nun in the afternoon, and Nun at night.
This is when you cannot stand each other any more, and your spouse takes you to court and screws you in front of everyone.
This is when you get a little each month, but definitely not enough to live on.