Does inability to multitask lead to cheating?

I was commenting in a friend's livejournal and I sort of made up a theory in the process of the comment that made a lot of sense and felt like it needed a little more attention, so I'm going to attempt to flesh it out here.

I'll start by saying that I believe there are differences in general between how men behave and how women behave. I don't know if these differences are due to nature, nurture, or some combination (which I think is most likely), and I'm also not saying "Every man acts such-and-such way, and every woman acts differently," because that's simply not the case. There are always exceptions, and there's as much variation between how any two men (or two women) act as between how any one man and one woman act. That said, as a(n amateur) sociologist, I feel that I can generalize about gendered patterns of behavior without resorting to sexist stereotypes and without insisting that all members of either group do (x) or (y).

Research has shown that women multitask better than men, while men focus on a task better than women do. Does this singularity of focus, and inability to multitask, lead to men getting into situations that cause them to literally forget about their significant others, and engage in infidelity?

If a man is singular-minded, and goal-oriented, can he so lose track of what he's doing that his S.O. doesn't enter his mind until after it's "too late"?

I'm not trying to create an excuse, but in light of the fact that nearly two-thirds of married men admit to having affairs, it's interesting to think about why this may be occurring.

Of course, this would not help at all in explaining why a significant portion of women also have affairs. Perhaps monogamy just doesn't work well for humans?