Yeah, Nodoka's new, but does she really counts as a person? but she's a very different person that everybody else. I'm not talking about the actual sex, I'm talking about any kind of sexual interaction. Miku - started from Ch1, since his "massage" session. Kirin, Chika, Futaba, Uta - since Ch1. Noriko - literally threw herself at him very early in Ch2. Io - only when he blacked out. Touka - I maybe don't remember that well, but he never explicitly tried to do anything. Just his usual, mild-level creepy flirting and suggestive phrases. No actual moves on his part.
So my point is - he's not creating new relationships. He's only dragging out the ones, that he started in Ch1 (and a little into Ch2). On the contrary, he actively rejects some girls, which would be unheard of in Ch1 - Molly, Imani (she's adult but still), Sana (until the end of Ch3).
Honestly, considering Nodoka has had a job since she was 10 and is already set for college, I can understand considering her more of an adult than the majority of the girls.
Also I was referring more to the "staying away from jailbait" part. If anything, the optional Chinami mention, and non optional Uta picture stuff, kind of shows he's getting worse in the background, not to mention the stuff Ami tends to hint at on his computer, and that folder of Maya..
Nevertheless, he's taken the virginities of about two students per Chapter.
(plus optionally Ami in Chapter 1, and apparently Molly in Chapter 2)
It seems likely that he'll take at least two more in Chapter 4. (Thinking it'll be
Sana, Uta, and Noriko, with one probably being forced or optional)
He's tried to get Io and Touka to "comfort" him a few times, but yeah he's only touched Io inappropriately when his wires were tangling. He barely met Uta in Chapter 1, and since Chapter 2 they've formed a relationship, as she wasn't even his student until then.
They've more or less began "dating" recently in Chapter 3.
Molly, Imani, and Sana are all special cases, that he is trying to resist.
He's already at least fingered Sana though, last update, and apparently raped Molly then blocked it out. He also needed Yumi to keep him from having sex with Imani.