メシマズの独り身野郎は4か月に一度しかシーツを洗わない
なお、♀単独個体は2週間、キャプチャー済は3週間～1か月ごとに洗う
毛布は3か月、枕カバーは半年洗わない

Almost half of UK’s single men wash their bed sheets just once every four months, study finds
https://www.independent.co.uk/life-style/single-men-bed-sheets-four-months-wash-b2067438.html