Chester and Martha had been seeing a marrige counciller for a good number of weeks, and he wasn't having much success at solving their problems.

During this one particular visit, in total frustration over the lack of progress, the Doctor took Martha and gave her a long slow kiss.

"There!! Did you see that?" he asked Chester. "That's what she needs."

Chester nodded.

"And she needs it, I'd say, three times a week, say on Tuesdays, Thursdays, and Saturdays," said the Doctor.

"No problem on Tuesdays and Thursdays," said Chester. "But I can't bring her in on Saturdays 'cause I got darts."