A proverb meaning that physical beauty doesn't keep one's interest for long (one quickly grows tired of a beautiful person).
彼はよく「美人は三日で飽きる」と冗談めかして言う。
He often jokes, "Beauty is only skin-deep".
新しい恋人に夢中だったが、結局は美人は三日で飽きるということがわかった。
I was crazy about my new partner, but I eventually realized that beauty doesn't keep you interested for long.
昔のことわざ『美人は三日で飽きる』は必ずしも現代に当てはまらない。
The old proverb "beauty is only skin-deep" does not necessarily apply to modern times.