A new survey has found that the number of straight men who have had gay sex is surprisingly high.

According to a recent survey, more straight guys are admitting to having had gay sex than ever before.

The survey – conducted by the Centres for Disease Control and Prevention – asked respondents about the types of sexual experiences they have had and whether they are attracted to the same or opposite sex.

The 9,000 respondents – aged between 18 and 44 – were also asked how they chose to label their sexual orientations.

Results showed that the number of straight men who have had sex with another man had risen significantly – with 2.3 percent of men engaging in same-sex sexual activity identifying as heterosexual.

The survey also revealed that the number of men identifying as bisexual had risen – with 2 per cent of the group saying they were attracted to both men and women, up from 1.2 percent in the last survey.

“You do expect some differences,” the lead author of the study,Casey E. Copen, said.

“For some people … they may or may not have had the experiences they’re contemplating, [especially] if they’re younger.”

Last year, a similar study found that half of all young people in the UK do not identify as 100% straight.

YouGov asked 1632 people to plot themselves on a Kinsey scale of sexuality, from 0 (exclusively heterosexual) to 6 (exclusively homosexual).

Just 46% of young people (aged 18-24) would rank themselves as 0 (exclusively heterosexual) – compared to 49% who picked something else.

However, the sharp increase is not due to a much greater proportion of people who are exclusively gay – with just 6% identifying as exclusively homosexual.

Rather, 43% of people identify themselves as somewhere between exclusively homosexual and exclusively heterosexual – showing people increasingly see sexuality in a less polarised way.