Haven't done many of these objectives, but now I'm trying to complete second one. Does game remember who has danced with who even between 2 different dance objectives, or howcome some of my dwellers go straight to business without dancing and causing pregnancies I don't want?

If a dweller couple has previously been with each other they will hit the bed a lot faster than before.

I can't remember if the game tracks who danced or not.

The higher the total C the faster they will get to dancing. If they're both maxxed at 10 it takes like 20 seconds.

The best way to do this is if u have your living quarters together put a woman (or man) in each room and have one of the opposite six go to the first room until they dance then deag him to the next room and so on....or back and forth from the same two rooms either way it works toward the dancing in living quarters objective and no the game doesn't keep track of who dances with who because like I said and have done every time is drag the same guy btw the same two women until it's done

I have 3 guys with high charisma for that and just change girls in room.

Pretty easy objective, I've just get a pair dancing, then order one out of the room and back in and wait for dancing again, it will still fulfill the quota.

Of course having multiple pairs at a time is faster.

I've never seen people make a run for the love closet before dancing though.

I just now took 2 guys from power room and 2 girls from restaurant and put them together, watched them all the time but first couple DIDN'T DANCE, they hugged and went to back room and BAM, accident baby. I think I'll X this objective away from now on because this really doesn't seem to be that simple. I've had at least 3 pregnancies during this single dance objective because my dwellers seem to be so horny that they skip whole dancing phase, arghh.

You don't have to have different people dance. I just make the same couple dance over and over.

Could be more efficient with multiple couples though.

But no matter what dwellers I put together, they randomly seem to skip whole dancing part and go straight to babymaking, which is annoying. I don't want any g*ddamn babies, I just want to complete this stupid dancing objective.

Dunno what the problem is there. Try a different room? Does the dancing objective count up at all?

Works for me without fail every time. I don't know what to tell you, I don't disbelieve you though, I'd say maybe keep them in view the entire time.

I've noticed that the game tends to gloss over events that aren't in view and otherwise wouldn't effect anything. For instance...

If molerats start appearing in an empty powerroom they cannot spread from I've noticed the event goes away faster if I simply pan away from it and go look at the rest of my vault. It glosses over the stages of the event and ends it prematurely since it will not have any further effect beyond the empty room. Same goes for fires and roaches.

Perhaps couples skip stages of animation if they are not in view... It may gloss over the stages similarly.

I doubt my own theory though, it's a long shot admittedly.

Dwellers can definitely hookup without dancing. Yesterday I was working on an 8 Couples Dancing objective. Drug a male dweller into the living quarters. As soon as he crossed the room and reached the female dweller, they bolted for the love closet and Pip Boy pops up with a trumpet flourish. I had to drag the running dweller back out of the room before they violated my One Child policy. There was no dancing beforehand and no credit toward the objective.