Construction costs - spent my whole budget on TP already. Also, as you can see from the picture, the bunker must be suitable for the containment of children, so any dildos attached could only be affixed to the external walls, pointing outward, and this would serve no functional purpose for the occupants. Actually now that I think of it, outward pointing dildos would provide an excellent distraction to any Corona-ridden would-be intruder faggots who were too busy butt-fucking to stock up on TP to build their own bunkers. So good idea, but again, the budget, so it'll have to wait.