Kiss and Don't Tell - S1.E19

Jimmy's younger brother Mark comes into town, but Beth is apprehensive about spending time with him since he hit on her shortly after she and Jimmy began dating. So when Beth learns that Mark's interested in their babysitter, she intervenes and discovers that Mark's not the slimeball that she always thought he was. But Beth finds that Jimmy is a bigger slimeball than she realized - particularly when she discovers her husband making out with the babysitter...