(CNN)More and more studies are shedding light on the "orgasm gap," which refers to how men orgasm during sex more frequently than women.
But why does this gender gap exist, and what can be done to achieve orgasm equality? After all, about 40% of women experience sexual dysfunction, associated with a chronic difficulty in achieving orgasm.
Experts are offering some answers.
"All groups of men -- gay, bisexual, heterosexual -- orgasm more than all groups of women," said David Frederick, assistant professor of psychology at Chapman University, who has studied human sexuality.
"Lesbian women orgasm more often than heterosexual women but less often than men," he said. "What makes women orgasm is the focus of pretty intense speculation. Every month, dozens of magazines and online articles highlight different ways to help women achieve orgasm more easily. It is the focus of entire books. For many people, orgasm is an important part of sexual relationships."
"We found that the distance between the clitoris and the urinary opening, which is called CUMD, indicates whether or not a woman is inclined to have an orgasm with intercourse or not, and if it's below 2 centimeters, then she likely is going to have an orgasm with intercourse," Lloyd said.
"If it's above, if it's around 3, then she's likely not going to have an orgasm with intercourse," she said. "Those were our findings, that have since been confirmed through other tests. So what that means is that if a woman doesn't have an orgasm from intercourse, it's not her fault or it's not his fault. It's not anybody's fault. It likely has to do with her anatomy."
For a woman with such anatomy to achieve orgasm, Lloyd recommended trying "manual stimulation of the clitoris during intercourse."
She added that studying orgasm frequency remains an important area of research since orgasms have been linked to greater satisfaction with personal relationships.
"Women who have better sexual relationships with their partners also have more satisfied relationships in general, and it improves the quality of their relationships," Lloyd said. "So in general, a better sex life leads to a better relationship, which leads to a better sex life. It's kind of circular."