To those wondering about the threesome options, here's what I've gotten to work on 980b.
Both Rogue and Kitty are at max love, obedience, and inhibitions. Emma trails behind by 2 points in love and 4 or 6 in obedience as raising her stats isn't at easy. The way I finally got Rogue to be willing to touch Kitty during threesome scenes was to pretty much spam the threesome options until she finally gave in and Kitty was willing to touch Rogue from the beginning, but I think that's just how she is from the get go.
Small details that probably don't have anything to do with triggering Rogue to change her mind and touch Kitty, but it probably doesn't hurt to list, both girls were stripped naked, started sex scene with Kitty via makeout option, kept spamming the "safer" options, kiss/grab breasts/suck breasts/finger. Rogue eventually accepted with the finger option.
Once Rogue and Kitty are getting along better, double dates will have them both taking action, rather than one girl winking at you but doing nothing. You also get an extra option on the sex menu that lets you watch Rogue and Kitty caress one another.
Rogue/Kitty and Emma are willing to have a threesome, but so far neither will touch the other, even though there are lines from Rogue saying how she loves touching Emma. Mostly during the Rogue/Emma scenes, I get error messages that nothing is being triggered and then a list of actions being performed. Leads me to believe that the Emma and Rogue/Kitty threesome options haven't been programmed in or are not working properly.
Another thing I haven't been able to find/unlock is Emma's milestone scene. I thought it had unlocked when professor Xavier told Rogue and I to stop making out in class and got detention with Emma and had a sex scene, but no go.
Hope that helps anyone looking to get the threesomes working, at least Rogue and Kitty's anyways. If I figure out Emma and Rogue/Kitty threesomes or Emma's milestone, I'll drop by with the info, but if anyone else knows anything, feel free to share.
Quick update, GuardianZ is right, just takes time for Rogue to get in the mood to fool around with Emma. Scene finally happened in the mornings at the showers, called Rogue over and as soon as I choose the threesome option, Rogue took the initiative and started sucking Emma's breasts. Maybe the area you try to get the girls to accept each other has something to do with it, but I doubt it.