Ok, HOW? In Canon, Chichi is a Killjoy Tsundere Mother, so far removed from a MILF as is possible while being discussed on the Internet, (which we all know is really really good for Porn) so how can she be THIs Level of Hot?
Guess that's what years of being neglected by your husband does to you. Anime has a thing for that kind of MILFs, if Sakura and Hinata are anything to go by, Chi-Chi is another good example. They are alone most of the time, and they are also too unimportant for the plot to take seriously, leaving these Oriental women in the perfect position to be claimed by white men... But of course, any resemblance to real life is purely coincidental.