Among American singles who have sex with a familiar partner, men have the highest rate of orgasm. The occurrence of orgasms in women, on the other hand, is less predictable.

According to a new study conducted by researchers at Indiana University entitled, “Variation in Orgasm Occurrence by Sexual Orientation in a Sample of U.S. Singles,” men experience an orgasm 85.1 percent of the time, while women experience an orgasm 62.9 percent of the time.

Sexual orientation appears to have little difference in the orgasm rate for men, while the pattern varies with women’s sexual orientation. Lesbians are more likely to experience an orgasm more often than bisexual or heterosexual women.

Lead study author Justin R. Garcia, assistant professor of gender studies and research scientist at The Kinsey Institute, stresses the importance of focusing on variation in sexual behaviors and experiences in order to improve sexual well-being.

“These findings may contribute to promotion of more informed sexual health, by reminding us to pay attention to individual variation in research and clinical practice — variation in sexual experiences, variation in sexual identities and variation in sexual outcomes,” said Garcia in a statement.

The differences in orgasms among all sexual orientations has been studied as early as the 1940s by sex researcher Alfred Kinsey. Since then, however, little clinical research has been conducted to further compare such differences. This leaves a disparity in our current understanding of sexual outcomes among various groups.

Partner communication is critical to shaping a couple’s sexual experience and outcome, whether spoken or not.

The findings of the study are published in the Journal of Sexual Medicine.