Listen to Granny because Granny always knows best!
The young and foolish may well expound a good deal of time and energy in search of the perfect sexual partner. The one whose touch turns your nether regions to a molten volcano, and whose manly appendage is capable of appendage-ing for a very, very long time.
Which may be enthralling when you are twenty, and even interesting when you are thirty. But, should mister pinky continue to be this athletic when you are forty or fifty it becomes a valid reason for divorce.
To be brutally honest, a man who performs quickly and falls asleep promptly will be far easier to live with… and he probably won’t even notice when you can’t be bothered to fake orgasm.