Hello, I understand your concern. Yeast bacteria are normally found in the vagina, but when their number outgrows the good bacteria, then an infection ensues There is a number of reasons you might be getting repeated yeast infections. Besides antibiotic use, a lowered immunity, poor eating habits, stress and lack of sleep are known to be very common causes. So a change in lifestyle and diet might very well resolve this problem. If you think your lifestyle does not need any changes, diabetes and hormonal imbalance are also very important factors that need to be considered in repeated yeast infections. A visit to the doctor and some tests will clarify this. Lastly, while vaginal yeast infections are not considered sexually transmitted diseases, they can be spread by sex. Wishing you all the best.