Dictionary.net

• the original forbidden fruit was an apple from the tree of knowledge of good and evil in the Garden of Eden; it is now used to refer to anything that is tempting but dangerous (as sexuality)

2006 - WordNet 3.0
By Princeton University

• the original forbidden fruit was an apple from the tree of knowledge of good and evil in the Garden of Eden; it is now used to refer to anything that is tempting but dangerous (as sexuality)

2011 - English Dictionary Database
By DataStellar Co., Ltd