Which is lazier:
Having the artist draw an insignificant character on one panel to be the "butt of a joke" (because hey, no background story is EVER going to be given for a "throwaway joke character")...
Thinking about which currently available character you'd like to use to "recton" his/her sexuality for said "joke", and have the artist draw HIM/HER instead...?
Just sayin'. ;)
But both options can give way to future stories.