The Gnostic Christians believe Judas and Mary M were actually Jesus' truest disciples, with Judas making the necessary sacrifice to help Christ shed his corrupt physical form and release his divine spark, and Mary M being the only follower that Christ told the "secret truth" of Gnosis to.

Its also claimed that Christ "kissed her on the mouth" which is said to be a phrase used to describe telling her these secret truths. However, she is also sometimes referred to in Gnostic texts as his consort (may be a translation thing).

Personally, this all sounds like a likely story for a betrayer and a whore to come up with in the wake of the crucifixion, but who really knows?