The PRESTO study is the one of the largest in the world and takes advantage of social media to reach both men and women who are trying to conceive. The massive study has already determined that you should be cautious with your caffeine and alcohol intake and aim to get more than 6 hours of sleep per night. But scientists are leaving no stone unturned. The online study assesses lifestyle choices that range from the type of underwear you wear and prescriptions you take, to time spent on your laptop (on your lap) and your lube usage.