 " Dinner Party " was written by Lee Eisenberg and Gene Stupnitsky . Other writers for the series also added various background gags to the episode , such as Andy wearing two sweaters and holding a coat , all of the photos in the condo being of Jan with other men , and Michael 's garage having both a <unk> and a <unk> back to back because " Michael is completely taken by late @-@ night infomercials " . The song featured in the episode supposedly performed by Jan 's former assistant , Hunter , was written by the episode writers Lee Eisenberg and Gene Stupnitsky and Todd Fancey of The New Pornographers ; Eisenberg and Stupnitsky wrote the lyrics , and Fancey wrote the music . The song was sung by Fancey . Eisenberg and Stupnitsky later explained that , despite the suggestive lyrics , the song is " left to interpretation " . 
