Studies examining the benefits of sexual activity on physical health have suggested sexual activity improves physical and psychological health in a number of domains. Sexual activity: (1) Increases longevity: Men with increased orgasmic frequency (i.e., had sex at least two times per week) had a 50% lower risk of mortality at a 10-year follow-up (Davey Smith et al, 1997); (2) Lowers the risk of chronic disease (e.g., heart disease and cancer): Among men, frequency of sex was associated with a lower risk of fatal coronary heart disease (Ebrahim et al, 2002). Furthermore, a national survey of US men found high ejaculation frequency (i.e., >21 ejaculations per month) was associated with decreased risk of total prostate cancer (Leitzmann et al,
2004); (3) Increases immunity: Increased levels of immunoglobulin A, an essential antibody used by the immune system to protect against viral infections, were found in college students reporting having sex at least three times per week (Charnetski and Brennan, 2004); (4) Associated with reduced stress: Participants who had vaginal sex in the last 2 weeks had lower blood pressure and stress response to stress-inducing tasks (Brody, 2006). Among medical residents, stress negatively affected desire, sexual arousal , and sexual satisfaction (Sangi-Haghpeykar et al, 2009); and (5) Increases physical fitness: Sexual intimacy was associated with physical fitness level among Fifty Plus Fitness Association members (Bortz and Wallace, 1999); frequency of sexual activity was higher among men enrolled in an intensive physical fitness program (White etal, 1990).
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