The results of a new study show that six out of ten middle-aged Britons don’t use a condom in a first-time sexual encounter.

Some experts say that these numbers may be the same for Americans, as in the US rates of all STDs (including HIV) are on increase with an estimated 19 million new cases every year. The U.S Centers for Disease and Prevention say that almost of STDs new cases are occurring among people 15 to 24.

However, the older adults are also at risk. Study’s lead author, Catherine Mercer, who is a lecturer at the Centre for Sexual Health & HIV Research at University College London, says: “Usually it is assumed thatSTDs are only increasing among young people, but data suggests that sexually transmitted infection diagnosis rates are increasing in almost all age groups in the UK.”

The report has been published in online edition of the International Journal of Epidemiology. It shows that most Britons engaging in unsafe sexual relations fall in 30s and 40s age group and have relationships where age difference is of five and more years.

“People, starting partnerships in their 30s and 40s and have low rates of condom use, are at great risk of sexual infections,” Mercer added.

Mercer and colleague collected data on more than 11,000 men and women for the study. The participants of the study were included in the second British National Survey of Sexual Attitudes and Lifestyles. The participants of the study were asked about condom use and how long they took to sex after meeting.