A study from Ludwig Maximilian University in Munich found that sexual satisfaction in relationships peaks just 12 months in.
The study, of 3000 people aged between 25 and 41, asked participants to rank their sex lives at multiple stages of the relationship.
Researchers found the main cause of decreasing sexual activity is domestic discord in the form of spats and arguments.
They speculated that 12 months marked a time when lovers had learned each other’s needs in the bedroom while still feeling mutually besotted.
This article originally appeared on Men's Health