demonstrating that our "sexual biology is geared toward reproduction." I'm surprised the % is so low. Certainly pre-experimentation with karezza, I would have felt like a very bad lover if my partner didn't ejaculate.
But what use is research in this area that doesn't also specifically ask about a karezza-type approach? And then implies so much about satisfaction in its title?
"50.43% of women considered it very important that the partner ejaculates during intercourse, 22.6% of women stated that they experienced a more intense orgasm when their partner ejaculated."
Study and abstract: The importance of male ejaculation for female sexual satisfaction and function