It was just one of the many health and wellbeing benefits derived from frequent sexual activity, Dr Hiestand, formerly from Dunedin, said yesterday.
The 46-year-old Las Vegas resident has made a career out of giving doctor's orders more agreeable than most.
''I definitely encourage people to have more sex.''
How much did she recommend? The once-a-week practitioners were not even close.
Dr Hiestand said to experience the full benefits, those aged under 25 should aim for more than once a day and those between 25 and 30 at least once daily.
Accordingly, those between 30 and 40 should have sex at least four times a week, and anyone over 40 at least thrice weekly.
''The anti-ageing benefits are amazing. It basically doubles your life span once you get to your 60s and 70s.
''I'm 46 and my husband is almost 64. We've been married almost 20 years and make sure we have sex at least once a day.''
Dr Hiestand said research - including her own - showed frequent sexual activity reduced the risk of breast and prostate cancer, relieved headaches, helped cardiovascular health and eliminated stress.
''The more sex people have, the more energetic, less depressed and more able to cope with life they are. It is the best stress relief. It helps women go through menopause easier because it balances hormone levels, and it increases libido.''
Dr Hiestand said the benefits of intimacy were also crucial.
She encouraged women especially to change their attitude to sex, from thinking of it as a chore to instead focusing on its benefits.
Originally from Dunedin, Dr Hiestand studied law at the University of Otago before leaving New Zealand in 1989.
She decided sexology was ''much more interesting'' than law and completed a doctorate in philosophy from the Institute for Advanced Study of Human Sexuality in San Francisco.
Her dissertation on the anti-ageing and health benefits of sex was documented in her book Anti-Ageing Benefits of Sex - Sex, the Ultimate Health Supplement.
Dr Hiestand returned to Dunedin to visit family this week, having been in China as a guest presenter at the Sexology Association of China's annual conference. This weekend she will be involved in the fifth Australasian Consciousness and Sexuality Conference in Auckland.
