During 2006, in Europe alone almost a quarter of a million new cases of chlamydia were registered.

This is an asymptomatic pathology in 70 per cent of the cases, but it's associated with sterility in men and women and ectopic pregnancies, and it may increase the risk of contracting aids or Lymphogranuloma venereum. These are enough reasons to be worried.

But it is unbelievable that sanitary authorities ignore the warnings of the World Health Organisation, which points to a 14 per cent possibility of failure in condom use while fighting Aids. One example is Africa, where NGOs and governments distribute condoms without tackling the problem of sexual promiscuity.

The Pope warned Africa against this, recommending chastity and loyalty inside marriages. It's proved to be cheap and effective in avoiding the rise in the number of people who are HIV-positive, which in Africa alone is 22.5 million. A significant part of that number believed in the false promises of safe sex while using condoms.