From Jon Grewer:

Re: Men’s testosterone levels dropping, study says (Nov. 4): I recall a study done some years ago using tennis players that found that tennis players that won had raised testosterone levels and players that lost had diminished levels. Perhaps in the age of clouded male roles here in the US, males here generally feel that they are loosing? It would be interesting to check the testosterone levels of football or soccer fans to see if their testosterone levels change with the win or loss of their teams.