So, based on this (pretty large) study, it would appear that straight women are coming (LOL) in last place in the orgasm department. But there's hope! Because what researchers also learned is a handy trio of moves that apparently are the most successful at delivering orgasms to women. As reported by newspaper The Guardian, a "golden trio" of "genital stimulation, deep kissing and oral sex" seriously increased a woman's chances of orgasm. There you have it.
If that's a little much for you, researchers were correct in their hypothesis that receiving oral sex alone is a huge indicator of how often someone has orgasms. According to the study, "people who received oral sex more frequently had orgasms more frequently." And this fact comes with an added bonus! The only group who didn't report having more orgasms when they received more oral sex were straight men. Literally all other sexual orientations tracked by this study reported they "usually-always" orgasm if they "usually-always" received oral.
So in the spirit of "two birds, one stone," and if you're committed to reducing the orgasm gap, demand more oral sex -unless you're a straight dude.