noun
love affair; sensual pleasures
Refers to romantic or sexual relationships, often with a nuance of intrigue or scandal. Can also denote the pursuit of sensual pleasures in general.
彼は色事にうつつを抜かしている。
He is absorbed in love affairs.
あの小説は色事の描写が多い。
That novel has many descriptions of sensual pleasures.
Compound of 色 (iro, 'color; passion; sensuality') and 事 (koto, 'thing; matter'). The reading いろごと is a standard rendaku form.