dollhouse. When not filming steamy skin flicks, Los Angeles-based adult film actress Lexi Luna gets down and dirty building — and occasionally smashing — doll-sized homes. “It’s the thing that is my therapy, that’s necessary for me…to turn around the next day and hit it hard,” said the 34-year-old, who has appeared in such films as “Getting Caught Sniffing Aunt’s Smelly Sneakers” and “Pearls Before Pies.”“Just like some people go and take an ice bath after they work out, I go and build a miniature house.” Luna has purchased or been gifted by her fans a half-dozen dollhouse kits, which come with wooden frames for the home and intricate materials to build furnishings like shelves smaller than her pinky and grain-sized soap bars.