There are three stages of sex.
#1 - House Sex - this is when you first get together and have sex all over the house, bedroom, bathroom, kitchen, top of the washing machine etc etc.
#2 - Bedroom Sex - This is the type of sex you have when you have been together for awhile - you now only ever have sex in the bedroom.
#3 - Hallway Sex - This is when you have been together for ages and as you walk past each other in the hallway you say "fuck you"