When was the last time you took a bath?
I have a theory (and you know I love a theory), that baths are like cornflakes. You sort of just forget about taking them (or eating them). You go about your business, perfectly happy, taking showers and eating muesli. But then you stay at a hotel, or a friend's place and they have a bath (or cornflakes) and you find yourself thinking: hey! You know? Why not?
And bang! You've sunk right in (or poured yourself a bowl) and you're remembering that baths are brilliant and that cornflakes make you happy.