These were Sims I created in CAS, not downloaded. I created them a long time ago, back when the demo was the only thing out, as I recall.
I've tried clicking the bed, and clicking each other. I have not tried it with other things besides beds; that hadn't even occurred to me. I did try clicking on each other, and I tried it from both Sims. Now that I think about it, I don't recall ever seeing the Try for Baby option with them, but I wasn't ever really looking for it, either.
I've never tried Try for Baby before, because I wasn't interested in having kids around while they were doing all their JA adventures. I'm not REALLY a family style player, tbh, I was just curious about how kids are dealt with in the game. And I haven't had them do much woohoo since they got married, other than once in a rocket and once in a bush. I listened for the lullaby sound each time and never got it.
I haven't had a chance to launch my game and test it with another family, but that's what I think I need to do. At least it will tell me if the problem is a setting in my game, or if it's something that got set in one or both of those Sims. Either way, I know it's something at my end, I just wish someone might have had some experience with it, so I could have a better idea where I should start looking to try to fix it.