adult video; porn video
Refers to pornographic videos; a straightforward loanword widely understood in modern Japanese.
彼はアダルトビデオをよく見る。
He often watches adult videos.
アダルトビデオ is the full term for adult video, while ＡＶ is the shorter, everyday colloquial abbreviation for it.
Variant with interpunct; less common but still seen.
Loanword from English 'adult video'.