There’s also the question of where it is to be stored.
If the police come round for a chat on home security and see a pair of legs sticking out from beneath the bed, thats got to arouse (pardon the wording) suspicion. (even worse if he’s gone for some time and comes back redder and sweatier than before, yuch sloppy seconds)
Or if you have friends around and they go into a cupboard to put something away, and there’s the doll slumped in a corner (real quick visit).
If it doesn’t work, jam a screwdriver in there and jiggle it about.