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no, your semen would not cause bacterial vaginosis most likely
she can eat more yogurt and probiotics which can help add good bacteria in her vagina
she should avoid using a douche and make sure she urinates and showers after sexual activity.
your semen pH is a very small amount of fluid and would not affect the pH vagina.
do not use non water based lubricants
non water based lubricants can cause BV