|Image from Bjorka Oddities|
Lovemaking is not a very demanding exercise. The most aggressive people burn about 250 calories an hour or 4 calories per minute while making love, and the average person makes love for about five minutes and burns about 25 calories. That’s less energy than it takes to walk up two flights of stairs. If you think that you shouldn't make love on the night before a game, you shouldn't participate in pre-game warmups; they are much more demanding than [love making].
Not Making Love Can Hamper Athletic Performance
On the day before competition, most athletes usually reduce their workouts and have extra energy. If they don't make love, they spend the night tossing and turning and wake up exhausted. Casey Stengel, the former manager of the New York Yankees, said “it’s not sex that wrecks these guys, it's staying up all night looking for it.”
The Buffalo Bills football players were rumored to have been separated from their wives before four straight Super Bowl games (1991-1994). You know their record: zero and four. The Minnesota Vikings also lost four Super Bowl Games (1970, 1974, 1975 and 1977). The directors of the 2012 Olympics in London knew better. They handed out 150,000 condoms to the 10,500 competing athletes.
The Scientific Data
Making love has been shown in scientific studies to have no effect on power or endurance (Clinical Journal of Sport Medicine, October 2000;10(4):233-315). Sexual relations do not weaken muscles (J Sex Res 1968; 4:247–248), and do not decrease endurance by reducing maximal aerobic power or oxygen uptake (J Sports Med Phys Fitness 1995;35:214–217).
However, it is possible that the emotional effects of making love may calm the athlete so much that he could lose some of the aggressiveness necessary for successful athletic competition. Nobody has measured the psychological effects that making love could have on athletic performance. We do know that making love can raise blood testosterone levels, and testosterone increases aggression to make an athlete more competitive.
Should You Make Love Before Competition?
It depends on what you believe. If you think that lovemaking will harm an important [game or match], don’t do it. On the other hand, if you believe that lovemaking has no effect on athletic performance, go for it. At least your partner won’t be disappointed with you.