Liz Summers, a 43-year-old personal trainer from San Diego, California, knows that exercising every day is a great way to stay in shape. But fucking is a great way to stay in shape, too. These days, she's fucking more than ever. "I went through a kind of an exploratory sexual time when I was in college, then it slowed down as I got older and then married,” she said. "I was loyal to my husband, and we had a normal amount of sex. But now I'm back to my old self, so to say!” Her old self? "Yeah,” she said, blushing a bit. "I've been fucking a lot.” Like we said, ya gotta stay in shape.