A guy I used to work with used to say to me “when you meet a woman, every time you have a shag, put a penny in a jar, after you marry her, every time you have a shag, take a penny out of the jar…I guarantee you’ll never empty the jar”. It’s “are the straights ok?” level of boomer humour, but it does amuse me, in an eye roll kind of way.
Lake Bells character in Man Up does really funny job of explaining it as “The Blowjob Paradox”.
It’s like saying USAians don’t have a sense of humour. Some USAians are MAGAt knob heads, some are perfectly reasonable people. More or less like anywhere else.