This included a description of more than 40 combinations of sexual acts that people perform during sexual events, patterns of condom use by adolescents and adults, and the percentage of Americans participating in same-sex encounters.

The National Survey of Sexual Health and Behaviour (NSSHB) is one of the most comprehensive studies on these topics in almost two decades and documents the sexual experiences and condom-use behaviours of 5,865 adolescents and adults ages 14 to 94.

Men are more likely to orgasm when sex includes vaginal intercourse and women are more likely to orgasm when they engage in a variety of sex acts, the new study has revealed.

According to the study's findings, one of four acts of vaginal intercourse are condom protected in the U.S. (one in three among singles).