My take on Kostja: only a few weeks ago he was a total nobody, acted like a virgin and didn’t know how to behave himself. Today he has a beautiful girlfriend, a place to stay and host a swinger party for 12, 14 people. He is making some progress! And now he wants to make sure that all guests are having a good time. Yes he is neglecting his girlfriend a bit but then she is an adult too and should be able to take care of herself. I could be completely mistaken.