Zlata is even less active than Lola, she spends 70% of her time on the sofa, and the other 30% in bed. The only time Irina did anything was when she came back with a guy, the same night Lola did, nothing happened that night, and after that she spent every night at his place. She didn't spend another night in the apt until the night before he left. And nothing happend that night either, in the 7 days she knew the guy that was probably the only night they didn't have sex, because she was at B2 not his place. Lola sets up a party in the apt and comes home with 2 cavemen for company, no chance of anything interesting happening there.
All 3 girls are perfectly suited to each other because they're all boring.