If someone asks you about what you got up to the previous evening, you can't really say ``came home from work, made burgers for dinner which were really tasty, had really hot sex for an hour or so and then watched question time. You?``. Or are you happy to happily drop it casually into conversation?
(obviously this being DiS no one here has ever actually had sex, so just imagine hypothetically. Or substitute `sex` for `masturbation`. Though that might be a whole different topic)