I think I fixed it.
I laid down cardboard over the whole thing, to keep the slats from moving around too much. Then I used a length of dowel on each side between the sideboard and the slats, so that the slats couldn’t move from side to side.
IKEA beds have been the bane of my existence for over thirty years. Twelve finishing nails will do the trick, six on each side. Never fails. One in each corner, and the other four in the middle.
That sounds like it should work unless the dowels roll off.
Or you can ask your next potential bed-slammer if he owns a power drill and would like to work on your bed before he works you on the bed. 
The dowels are between the side of the bed and the ends of the slats. There’s no place for them to roll to.
How would her orientation during intercourse keep the slats from falling out?:dubious:
You go back to IKEA and buy the slats that are slightly arched upwards.
You re-opened this thread to repeat something that was said almost two years ago (post #12)? Why?
(bolding mine)
That might not help to keep the slats from falling out, but it might help to keep the frame from banging against the wall. 
Because I am an idiot. :smack:
All I can say is, I’m glad I haven’t done anything silly like that.
For at least an hour now. 
Well, your username IS Hello Again.
Reported.
OK here is the real fix, buy some 3" black heavy duty Gorilla tape cut pieces 6" long and tape the slats together where they meet in the middle , will not fall thru, foolproof
Well, my fixes never did really work and the bed eventually became a mess of cardboard and dowels. But somehow I found a guy to marry me anyway, and we’ve graduated to a slightly nicer IKEA bed.
Oh my goodness… you are spot on in my case… I am now thinking why I didn’t put those plastic pegs? (Image 17)… Usually I know IKEA doesn’t give extra items… (hardly ever)
So finally I put those pegs and everything is awesome…
You are a life saver… seriously… I have been troubled for 2 months now… :D:D:D