Anxiety
Some people feel self-conscious at the check-out stand
We know the visual cliché from film and small screen…
YOUNG BOY walks up to the check-out stand and, nervously, gets 4 packs of gum, a Woman’s Journal, and a Coke so as to cover up that he’s got 1 package of condoms on the conveyor belt
This generally gets played out in that the cashier is a relative of the girl upon whom our YOUNG BOY has designs, or the condom needs a price check, etc.
This scene has been played out in both in The Summer of ‘42 and the venerable crappy teen drama that launched a thousand crappy teen dramas (and the career of Kevin Smith), Degrassi Jr.