Those that don’t have intercourse in their teenager years have been in the minority, nevertheless the reasons for—and results of—waiting differ for everyone else. Keith McDorman walks into the straight back room of a Austin, Texas cafe. Together with his dirty-blond locks, light eyes, week-old beard, and striped button-down shirt, he seems like a more youthful, smaller, bohemian form of Bradley Cooper. He tosses their scooter helmet on the wood dining…