Keeping fit and healthy is the key to a good sex life, researchers have suggested.
A US study found healthier people have longer sex lives and are almost twice as likely to be interested in sex than those in poor shape.
The study on more than 6,000 people also found fitter people have sex more frequently - once or more a week - and enjoy better lovemaking, particularly men.
Furthermore, healthy males can expect to have a longer sex life than women, lasting into their 70s, the study found.
It said men, aged 30, can expect another 35 years of sexual activity compared to 31 years for women.
While, men in their 50s can hope for another 15 years while women generally have another 11 years of sexual activity.
Being married or having a partner makes this gender difference less obvious, the research, published online in the British Medical Journal (BMJ) found.
Nevertheless, it seems men overall are more interested in sex and more report a good sex life than women.
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