Being attracted to someone and acting on that attraction are two very different things, Foxy.
I know. But they are still in relation to each other nonetheless. What I'm saying is that the higher the number of people who can attract you, the higher the risk you fall in temptation.
you don't have to be bi to have a wide range of people you're attracted to; there are men who are attracted to all types of women, and women who are attracted to all types of men
Yeah, but those are still women only and men only. No way it is as large a pool than both genders combined, like in a bi's case.
Cheating boils down to the a person's personality
Course, but when you make this kind of reasonings involving probabilities, to be fair you gotta speak according to the same model for all the cases.
For example, the type of person you mentioned earlier, which is attracted by all types of women/men. Take an individual with that personality, unisex. His/her "attention" (can't find a better term, this one implies that the subject in question goes looking for it, but bear with me) will only be directed to the opposite gender.
Now take the same personality, but a bisex individual. You know for a fact that his/her "attention" (again, probably wrong term) is directed to both genders. There's no way the risk of succumbing to the temptation is the same as the previous individual. Chances are bound to be higher, there will be more people to "resist" and be exposed to at the same time, which of course is a tougher challenge. You know what I mean?
I don't think it's true, Rebel. I think many people dismiss a person's sexuality's importance because nowadays, if you take it into account for anything that is controversial (like the probability of cheating), people are gonna see you as having prejudices against a particular sexuality and call you homophobic or something like that, and because people belonging to the particular group(s) brought into question are gonna get defensive.
I think that realistically, totally negating the importance of sexuality in a matter that clearly concerns it (among other things, of course, such as personality, like you said, or force of will, or each people's way of life, etc) is something that shouldn't be done.
So, to end it, I do think there IS a basis for that claim. And I repeat, a basis. Obviously more than just sexuality should be taken into account, but at the same time I do not think sexuality has no role at all, and I think it's pretty foolish (no offense to you and
@Shadow of course, you two know I'd never offend you, just talking in general) to claim so.
Moral of the story, don't mess with "Gigantis!" 
