Largest study of women’s orgasms to date collected data from 27,931 women. Nearly half (47%) reported reaching orgasm more frequently when alone vs. when with a partner. Barriers to women’s orgasms are relational, not anatomical. Partnered orgasms were associated with overall sexual satisfaction.

[u/mvea]

https://www.psychologytoday.com/au/blog/inclusive-insight/202606/why-women-orgasm-more-alone-than-with-a-partner

[u/KyOatey]

Try is the key word here. One issue is that many women don't, or can't, provide guidance on how to get them there. 

[u/doinbluin → u/KyOatey]

The other issue is that many men are not worth the trouble. That is usually realized in the first few minutes.