The empirical fact remains that we tend to find people with dilated pupils more attractive. This has been studied since the 1960's (Some guy named Hess did most of this). This is an unqualified fact for men. It has a few caveats for women but is still mainly true.

The fact that our pupils dilate when we see attractive people is a different issue, but possibly related. Actually, our pupils also dilate whenever our cognitive load increases. So when we see unexpected or new things they also dilate. But that's a different issue. That Ask men article is only scratching the surface and is ignoring the strong empirical evidence that showing interest with dilated pupils makes you look more attractive. Here is a more reputible source with actual data to back up their assertions:

http://dx.doi.org/10.1016/j .evolhumbehav.2004.05.001

 Their main results, "As expected, the relationship of attraction to pupil size was positive and linear for males viewing females. Females, however, rather than showing the predicted inverted U function, showed consistent preferences for either medium or large pupils in males"

 Also:

Bull and Shread main result, "pupil dilation in the female photographs caused such faces to be rated as more good-looking by the two oldest groups of male observer"

By the way, that last paper also showed that women found the dilated pupils in pictures of women to make them less attractive. Huh.