Question about Maggie

Does anyone know what episode Maggie had the one night stand after she tried to seduce Will (or something like that)? It seemed like a turning point in the show to me, before that she seemed like a virginal character (as far as we know). It was also when I lost track of the show on AMC, and hoped to start again where I left. Amazon used to have this show for streaming, free with a Prime membership, but I never got around to it and now they don't have it any more. I hope it gets released on DVD (and Blu-ray) eventually.