I allow them to play with it for a little, and then I put them in a safe place I know the kids can't get at them.
If I leave them on my desk, I know they will get it...so I don't leave them on the desk.
If a 12-year old is swallowing these things, there is something else going on in that household that needs to be addressed.
Or rather, how does one treat the sale of adult toys.
Living in civilization is all about giving up our freedom to do certain things in exchange for the protection and comfort that society offers.
Living in a civilization is about joining a social contract to not infringe on each others rights. (theft, rape, murder, etc infringe on the victims rights, where as buying Bucky Balls does not affect anyone but the purchaser)