I offer cuckolding with my straight male duo partner & my experience has been that most who contact are like you. Very turned on by the idea, but are not ready to pull the trigger. I get lots of calls on my phone sex lines from men who love to discuss their cuckolding fantasies.
To answer your first question , I do believe there is often a desire to interact with a male that is not necessarily easily admitted. I regularly ask my phone sex callers if they would clean/blow my male partner and they are always willing. But, rarely do they express any desire for male/male interaction before I mention it. They want permission to indulge in their kinks and the illusion of being forced removes their personal responsibility. They don't have to own up to wanting to suck/get fucked by a guy because they're doing it for me. "I'm not into guys, she told me to suck him off".
As for the second question, I love the idea of fucking a man while another watches. I'm quite the exhibitionist and one guy has never been enough for me, anyway.
Ultimately I say, do what makes you happy