Simpsons fans may recall many moments when something bad happens to Lenny Leonard, and Marge's first response is: "Not Lenny!" If she said it once or twice, it'd seem simply polite. But she says it often enough, and in a way that hints at a more personal, a more "intimate"relationship.
Marge has never had a romantic relation with Homer's co-worker, and drinking buddy Lenny. But there have been a few quickies. Lenny has always found her hot, and is always willing to give her a poke. Every once in a while, Marge is willing to let him.