Maybe Clark got tired of Lois reminding him every week that she saw him naked in the season premier, and asked Lex to get rid of her.

Didn't they already go the succubus route in "Heat" back in season 2 with the substitute teacher that instantly married Lex?

The conversations Clark had with his parents individually were great though, leading Clark and Chloe to be candid with each other by the end..

Plus, it's getting tougher for Lana and that coach guy (forgot his name already) to continue their hidden "relationship". I can't imagine having someone casually ask me "Are you seeing anyone?" and being unable to give a spontaneous and constructive answer. I predict Lana and that coach guy (still can't remember his name) will be discovered by accident, and the one to discover it will be Chloe, and this will happen before November 10th.