The defensive protein of men's penis was boosted by female hormone oestrogen. It acts as a "living condom" and and is able to decrease a man's risk of contracting HIV.

Andrew Pask and his colleagues from University of Melbourne developed the cream that consists female hormone oestrogen. They applied Oestriol to the inner foreskin of the penis and found that oestrogen increased the defensive protein keratin in the skin by four which acted as a barrier against HIV

In countries where circumcision is not religiously or culturally accepted, oestrogen treatments to the penis may become very effective in reducing the spread of the disease. This is really significant finding in modern biology because this hormone acts like biological membrane through which HIV particles can't get. It cannot be used as a contraception; but it is a living condom and a perfect protection against HIV.

If all men in the world use oestrogen as a protective factor, according to mathematical models developed by scientists, within say 50 or 60 years, that the level of HIV in the world would be reduced by 45%. The study is available online.

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