Adolescent Sex is the debut album by the English band Japan, released in March 1978 by record label Hansa.

According to AllMusic, Adolescent Sex "snarls with leftover punk intent, a few glam rock riffs, and a wealth of electronics that not only reach back to the band's youth, but also predate much of what would explode out of the next wave of British underground.

Trouser Press wrote that the album "introduces Japan in all its guitar-rock misery, playing such Bowie-influenced tripe as 'Wish You Were Black' with less style than a sense of urgency".

Their record company were not that ecstatic with the British sales either and required another album, this time aimed at the lucrative US and European markets.

"[12]All tracks are written by David Sylvian, except for "Don't Rain on My Parade" by Jule Styne and Bob Merrill