Tiffany is the admiral's daughter. She has multiple stages. The first thing you get from helping her is the trading tool that appears on her data pad in the cargo bay when Callisto is docked in port and one of the Marvins are there to trade. You can also access the same tool from the computer in the captain's cabin.
After you successfully make a few trading runs, Doc Julia will take you aside and tell you to speak with Tiffany in their room. This is where the kinky trials begin and much of it is random so you want to save often because if you screw up the random order of events, you can either wait until the next day to try again or reload that save I recommended and try again now.
You CANNOT unlock all of the sex scenes with Julia and Tiffany until you complete the challenge. However, if your affinity with Tiffany is high enough, you may invite her to bed with you. You start with only foreplay and work your way up to include all of the sex positions too. I think you CAN unlock all of the sex scenes in the captains quarters with Tiffany before you meet up with Tiffany and Julia in their room. That MAY cancel the kink test quest, IDK for sure. I never sleep with Tiffany in the captains quarters until after the scenes with Julia and Tiffany play out because once you unlock those, they are repeatable. The overnight sex scenes with the girls in the captain's cabin are also repeatable. But, how many positions to which you have access depends on your "score" with that girl. Sleeping with one girl raises that girl's score but will lower another girl's score or even multiple girl's scores. So, it is definitely a balancing act. It is impossible to get every girl to 10.0. It just isn't possible. However, you can keep them all between 5 and 8. Having at least 5 with Alice and Rachel allows the MC to be invited to their quarters for sex. Try to keep Julia and Tiffany over 6 and Tanya and Kira at 8 or more. Visit the doc in her clinic during the day to enhance MC's points with her, I rotate between Lia and Tanya at night in the captain's quarters most of the game. You want to keep Lia at 8 minimum as well in order to qualify for her ending. You also need a decisive victory in the war.
I have played Callisto several dozen times now and have never encountered a bug of any kind. The game works. You have to try to cheat to break it. So, don't cheat, just play the game. If the sex scenes to which you were referring as unlocked are the ones in the captain's cabin overnight then the kinky quiz time with Doc Julia and Tiffany may not trigger properly. That event is designed to help you build your score with Tiffany without tanking the other girl's scores and it works if you pursue that before sleeping with Tiffany in the captain's cabin at night.
Your best bet may be to start over and follow the walkthrough on the OP here...
https://f95zone.to/threads/callisto-v1-00-xavster.34378/post-8516247
I do NOT recommend using the multi-mod aka cheat mod as manually manipulating things can break the game. For instance, if you use the cheat mod and turn up all the girl's affinity scores, you just robbed yourself of a whole bunch of scenes that will not trigger properly now. If you follow the walk through, you will not only have good scores with all the girls and NOT miss any content, you will also have more cash than you need as well. Best advice I can give there is trade as soon as you get the tool from Tiffany as often as possible. Look for deals that will net you at least 20 credits profit per ton or more if available. Eventually, the trade market will balance out to where it gets difficult to make a solid profit. THAT is when you concentrate primarily on salvaging old wrecks to sell parts/weapons at the junk yard or free cargo to sell off at the best port's resale price.
I know this is more than you asked but your question was on the vague side. So vague, in fact, that professorX10, who is a member of the dev team, thought you were in the wrong forum... So, if/when you need help, please be as specific as possible. There are pages to track everything in the game, LI scores, trade pricing, what upgrades you have/need, what quests you have completed, tasks yet undone and those you have yet to even touch are all listed and coded to let you know where you stand with each task. The quest/task log page also has replay functionality for additional views of certain events. So, make use of all of the little buttons, check to see what they each do as they are all important, this includes all of the buttons attached to the HUD as well as the tools in the captain's computer. I do use one cheat in this game which is rather old school but effective and that is save skimming for salvaging runs. I make a save before we go on a salvage and see what we get. If it's not a good haul, I reload/replay; if it's a decent haul but I think we can do better, I save that progress before I reload/replay. I'm not a fan of getting to the scrap yard to turn in salvage and finding something I thought would be worth 10K credits is only fetching 2K... So, I often run a few options and see which one paid the best and keep that. But, save skimming won't break the game, a cheat mod can.
Hope this helps you my friend. Adventure ever on, Phat
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