Research Study: Participants must be male, fit, 18-24 yrs, max 140lbs, white non-hispanic, straight or gay. Participants will be selected based on answers provided in initial questionnaire which will be sent. Each selected participant will attend a private interview session and asked additional questions during 1-3 hrs. Physical exam included. Provide 1 head-to-toe photo with age and weight. Paid at completion of each session.
