Getting in shape won’t make most people better lovers because making love takes only the amount of energy required to walk up two flights of stairs. If you can walk up two flights of stairs, you can make love.
However, those who overdue it in the gym or on training runs – may find themselves too physically exhausted to make love, or at least to do so regularly. By the time that happens, you will probably have sore muscles all the time, will hate exercising, and probably be headed for an injury.
Just one more reason (and a darn good one) to ensure proper rest and recovery after your workouts.
Source of the story, a study in the medical journal, Fertility and Sterility,