If you're a man and you want to have children, you might want to pass on that relaxing soak in the hot tub.

"Male fertility plunges with frequent dips into the hot tub but may recover when men stay away from long hot soaks," recent research suggests. The study involved men who regularly used a hot tub, heated Jacuzzi or hot bath for at least 30 minutes per week. The men's semen quality improved when they stopped using hot tubs, etc.