I was given to understand "just think about baseball" was more of a common euphemism than it apparently is.
Basically Doc is, at heat, still a gentleman, and trying not to... overtly signal his intentions, so to speak.
As a bonus, in the "jokes a little too crude for TWB" department, an idea I had while trying to come up with a gag for Friday's strip, was Cara noting "well, somebody is awake", or something like that.
To which Doc replies "I've had that since we parted at noon. Technically, if those commercials are to be believed, I was supposed to go see a doctor four or five hours ago."