This article is from the Group B Strep FAQ, by email@example.com (Cheryl Sandberg) with numerous contributions by others.
GBS is naturally occurring bacterium in the human body of both women and
men. Since it is commonly found in the vagina, some people wonder whether
GBS is a sexually transmitted disease. The answer is "no". GBS bacteria
usually do not cause genital symptoms of discomfort and are not linked
with increased sexual activity. Women found to carry GBS do not need to
change their sexual practices.