Scarleteen

This is really a theoretical kind of question, although I do have a lot of PiV sex without barriers so it's relevant. I understand that ejaculating inside someone's vagina without any barriers can cause temporary changes in pH, and that changes in normal pH can encourage yeast infections. I don't know if yeast would prefer more acidic or basic environments and I don't know if semen makes the environment more acidic or basic. Assuming those factors lined up, could regular (as in daily or multiple times daily) intercourse of that kind affect the likelihood of yeast infections?

Yeast generally prefers more basic environments, and semen can change the pH slightly, but the vagina is usually pretty good at regulating itself, so unless there are other contributing causes as well regular intercourse isn't likely to make a huge amount of difference.