THERE are five secret signs that can help you tell when a woman last got lucky. According to sexual health expert Samantha Evans, co-founder of Jo Divine, this is what you should watch out for if you want to know that she's recently enjoyed sex. If a women enjoys frequent steamy romps her body releases pheromones — scented sex hormones that stimulate attraction in the opposite sex — which can increase your arousal. According to a study by the University of Colorado Boulder, the more frequently you get down and dirty the happier you judge yourself to be.