It was an intriguing emailed invitation: Mom, do you want to go with me to SlutWalk? Hmm. Well, over the years I have accompanied my daughter to playgrounds, petting zoos, hiking trails and nail salons. But for someone who spent years trying to keep two daughters in the equivalents of pinafores, SlutWalk sounded like a questionable mother/daughter outing. However, my older daughter, 22, had sent a link to the explanation. The SlutWalk, held Saturday in the Loop, was a response to a Toronto police constable's remark that women would be safer from sexual attack if they avoided dressing like sluts.