Seems an odd thing to insist upon, suspect mostly that they want their ego stroked more than that bit between their legs.
I hold no illusions about my ability in bed so even if she "orgasms" I'll just assume she's faking it for my benefit, I honestly hope they do enjoy being with me but believing I can bring them that level of pleasure is just a leap of faith too far for me, internet dating has taught me that I'm clearly unattractive and in my mind if I was that great I wouldn't be paying.