All of them are a bit childish for their age. The redhead is the worst. Yes, she comes from an all girls school and has have a sheltered life, but she talks like if she were 14 or 15 more than 18 and seems to be really naïve. But at the same time, she starts seducing MC since the first time they met and has a lewd scene with him the very first night, so she actually isn't so naïve... It's not congruent. The same goes for the brunette. She has no experience with boys either, but it seems she wants that MC becomes her boyfriend after just a few hours of knowing him. Not a lot of sense.
It seems that Eve has had more vital experiences and knows when a boy is trying to get laid with her. Also, she's not shy with MC and asks him to show his cock the first night after only a few hours of knowing him. She's not interest in kissing and cuddling like the redhead and the brunette, just the cock, straight to the point, kinky little bitch, but... she's virgin. It's not congruent, either. Also, MC is a Casanova. He has skills and balls to seduce every girl or woman around (including mature women that barely knows) to have sex or lewd moments in just a few hours. But He's actually virgin too! Yes, he had sex a few months ago, but he was drunk and he doesn't even remember the girl, so it doesn't count. It's not congruent either.
You can say "it's just a porn game, it doesn't matter", but I think the dev is trying to create a good product and to tell a good story, not just an excuse for lewd scenes for a quick fap, so it matters. The pace of the scenes should be better. What happens in just a few hours, from noon to night, should take at least a week.