In girls and women only. A vaginal discharge with a fishy smell. It develops when some types of vaginal bacteria grow more strongly than others. Having sex does not cause it. It is easy for us to test for BV and treat it.
Most women get thrush at some point in their lives.
Candida is a fungal infection, which is not caught during sex. Boys and men usually get it much less frequently than do girls and women. They usually have a red, itchy rash at the head of the penis. Girls and women usually get itching, together with soreness and vaginal discharge. Usually, it will be easy for you to treat yourself with drugs bought 'over the counter'.