Which of the following is sex said to be able to protect the body against?

Explanation

Research from Pennsylvania shows that sex increases your immune system. If you have sex at least once or twice a week the body's production of immunoglobulin A increases. This in turn helps protect you against the common cold and other nasty infections. Russian researchers have also concluded that pheromones, the production of which also increases during sex, also has a positive influence on the immune system.