No auto join in for threesome and more?

[GECK.O]

I have a problem where my sims never join in a woohoo autonomously. 

 

I saw they do it frequently months ago when I first installed TS4 after a long break.

 

Then I never see sims do it anymore. May end after I updated WW to the newer version.

 

I wonder if it just me?

 

And what is wrong with WW? Because I already turned on for auto join in option in setting.