Dictionary:

raunch

  (rônch, ränch)

1. Lewdness; vulgarity; obscenity.
2. Material or a performance that is sexually explicit or evocative: “Audiences are still astonished when she goes for the raunch” (Katrine Ames).

[Back-formation from RAUNCHY.]

noun

1. The quality or state of being obscene: bawdiness, coarseness, dirtiness, filthiness, foulness, grossness, lewdness, obscenity, profaneness, profanity, scurrility, scurrilousness, smuttiness, vulgarity, vulgarness. Slang raunchiness. See decent/indecent.
2. Something that is offensive to accepted standards of decency: bawdry, dirt, filth, obscenity, profanity, ribaldry, scatology, smut, vulgarity. See decent/indecent.