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For women, having had three or more partners in a year was linked to a decline in libido alongside having children under five.
Having sex at least once a week slows aging in women - even if they do not enjoy being intimate, research found in July.
One possible explanation is the menopause, which hits women around the age of 51 and causes a loss of libido, as well as other often debilitating symptoms.
Experts also say that middle age women are under more stress than other groups, with the competing pressures of family life and work.
It's assumed to be a decade of sexual exploration and first true loves, when your attractiveness has peaked and you have the time and energy to get wild before babies come along.
However, when it comes to feeling most attractive and having the best orgasm, it apparently gets better with age.
The participants were asked about their experience of orgasms, feelings of attractiveness and how much they enjoyed sex, in the research commissioned by contraception app Natural Cycles.
Their answers were analysed by age group - younger (below 23), middle (23-35) and older (36 and over).
Logic may suggest that our twenties - usually the most care-free years - is the time to have the best sex of your life.
But men who had children were no less happy with their love lives.