Are you 16? I get the complaint that the releases of this game are glacially slow, but saying that she either cheats or does not ignores the corruption aspect of the game and the very nature of cheating. People usually start an affair from light touches and brushes, some talking and some flirting and end up skipping lunch to get to a motel.
Cheating is like public sex or risk activities. If you think it too much, most likely you won't do it. It's fine, not everyone is prone to take risks. What you describe is fine, but that's not what is happening in the game. There is not a setup (bored housewife), a spark (whatever happens that triggers her idea to cheat) and the action (the cheating itself) which might happen after a bit or a lot, in my experience just a tad bit. The game is about the idea of cheating and going in circles doing this /that with this one / that one. Very typical in the genre of corruption. It's a kink, it could keep going around this idea forever and people would still be happy because that is exactly what they are looking for.
As she has no sex with anyone besides The CONNOR, there is no cheating.
BJ does not count as sex, so it can't be cheating! Let's call it deep networking.
To be fair that sentence was meant for AWAM =D The one I wrote before about being a slut applies to Jessica. As I said, if she was the dominant type the Parker route makes a whole lot of sense. But she is not, it's kind of an exploration theme. Let's see how much of a slut I can be. And as you said, she already ate the sausage. There is no real reason to no go further. But since the event to get to the BJ scene was elaborated, I have that feeling that the event to get to sex will also be.
That is highly contrasted to the other characters that pushed her. She lets them do. She is overall pretty submissive. Her "lesbian" friend gets that and pushes her forward. Jessica enjoys sex, has a magnificent sex life already but somewhat is open for more.
Don't get me wrong. I enjoy Jessica as a character a lot and I don't actually think the pace is slow. Any sex with Connor tends to be OK'ish because it shows her slutty nature. I just really feel that the dev has it easier to have her cheat with any man who is pushy enough rather than Parker. But who knows, maybe I am wrong and we have Jessica fucking in the kiosk soon enough as she should be.