A new study has revealed that a great sex life will not only help you feel and look younger — it will also help you live longer. Coffee can help boost a flagging libido. Dr Eric Braverman, an anti-ageing expert from the US, has written a new book 'Younger (Sexier) You,' in which he says that sex not only raises your hormone levels (so keeping you young), but can also boost your metabolism, brain function, heart health and immunity. Braverman says that coffee can help boost a flagging libido, while snacking on peanuts can enhance arousal, reports the Daily Mail. Eating brown rice can help combat sexual coldness, while avocadoes might increase your capacity for pleasure. Braverman also points to a study by Queen's University in Belfast that suggested having sex three or more times a week reduced the risk of heart attack or stroke in men by half. Orgasms are thought to fight infection - increasing the number of infection-fighting cells by up to 20 per cent.