Given that L&P often uses cryptic language, I'm wondering if this "unexpected" character that will be the first person she has sex with outside her marriage actually means a character that we don't expect her to do it with. It would honestly seem strange to me that, given her general reluctance and moral objection to doing things with Dylan, Ellie, Patricia, Sam, etc, that her first extra-marital tryst would be with someone like Neil, or Jason, or Mr Murray, or even Vicky.
Even if she's a little sex-starved on the Filthy and Lesbian paths by avoiding all the GW sex, she's not an impulsive person and therefore not going to jump on just anyone. Plus, there are so many characters that she hasn't really been building that kind of connection with and I think she's much likely to do it with someone she has been building this connection with, not just some random character that only pops up occasionally.
So I'm wondering, and also kind of hoping, that L&P doesn't mean it would be one of these fringe characters we've only seen once or twice who is the "unexpected" character, but that it will be a character we do expect and it happening this soon is what is "unexpected". So it would still be an "unexpected" character because we don't "expect" it to happen quite this soon with them.
"Most" males? Try all of them.
Even Dylan and Sam aren't exactly perfect.