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Many people seem to wonder how often they should be having sex, as though there is a magic number that is the same for everyone.

While the amount of sex you have depends on a range of factors - including sex drive, health and lifestyle - it seems that age could be used to predict how many times in a year you should be having sex.

A study from the Kinsey Institute for Research in Sex, Reproduction and Gender has suggested that age can suggest what the average number is in terms of sex sessions.

It seems that the amount of sex people have on a yearly basis diminishes over time and it probably comes as no surprise that those on the lower end of the age scale have the most sex. People aged between 18 and 29 have, on average, sex 112 times a year.

This is compared to just 86 times a year for those aged between 30 and 39 and 69 times for 40 to 49-year-olds. However, the change is purely down to physical issues that can affect sex drive.

According to the study, the reduction in sex coincides with the increase in family obligations, everyday stress and the greater strain that illness can take on individuals.

Dr Justin Lehmiller said in a Kinsey Institute post: "The basic storyline that has emerged from these studies is that, as we get older, our odds of developing chronic health conditions increases and this, in turn, negatively impacts the frequency and quality of sexual activity."

It was also found that marriage plays an important role in sexual activity, with 34 per cent of married couples having sex two to three times a week. A further 45 per cent said they had it a few times a month, with just 13 per cent admitting sex sessions only take place a few times a year.

However, researchers highlighted that there is no 'normal' when it comes to sex, as everyone has different lifestyle factors and drives that can impact how many times they want to have sex. So, as long as you're having fun and are fully protected, that seems to be all that matters!