Conversation so far:
who is in prison in gossip girl season 4?
Ben Donovan is in prison in gossip girl season 4
what led to imprisonment for Ben Donovan in Gossip Girl Season 4?
Lily has Ben charged with transporting a minor across state lines and statutory rape, and was told that Serena signed an avidavit confirming that he did so.
what was the relationship with Ben Donavan and Serena in Gossip Girl?
Serena and Ben were in a relationship.

Question: was there any truth behind the charges?
Self-contained rewrite: was there any truth behind the rape charges against Ben?