The "orgasm gap" is caused/exacerbated by women not being hot enough to attract orgasmogenic men:

Men's masculinity and attractiveness predict their female partners' reported orgasm frequency and timing

Human female orgasm and mate fluctuating asymmetry

70% of women are overweight or obese.

If more of them lost weight, they could attract attractive masculine men that would on average lead to a higher likelihood of orgasms.

It's science.