This is when the sex in your relationship hits a peak
New relationships are brilliant.
Everything is rosy, you're madly in love with each other and every waking moment is taken up with having sex.
Your mates are constantly taking the piss because you're always being mushy and holding hands in public and calling each other gooey names, but you don't mind - because the sex, obviously.
Your blossoming love is still in full bloom. But that glorious honeymoon period doesn't last and lustre soon fades.
It doesn't take long before you're farting in front of each other, rowing about the housework and choosing to watch Match of the Day over an early night.
Science though has pinpointed the exact moment when a relationship hits its sexual peak.
For anyone who's been in a relationship a while now the sex has probably already reached it's zenith and it's all down hill from here.
Around 3,000 couples aged between 25 to 41 were surveyed by researchers once a year for three years.
They were asked questions like “How satisfied are you with your sex life?” and “How often do you have sex?” among others.
They found that for most people sexual satisfaction increased during the first six months of the relationship but was highest during the second half of their first year in a relationship together, according to the study which was published in the journal Archives of Sexual Behaviour.
The scientists running the study believe satisfaction increases during the first year as the couple learn what each other likes and about their sexual desires.
But after this initial 12 months it all starts to decline.
The data suggests that changes in the amount of sex the couples were having partially accounted for the fall in sexual satisfaction in the second year.
Decreases in sexual passion could also be a factor in this. Or Match of the Day, who knows?