Will having too much sex affect my pH, or give me vaginitis or thrush? Or will it give me a STI?
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Here's how Prof. Graziottin answers this question from her patients:

Use condoms consistently, from the beginning of intercourse, in every sexual intercourse with no exceptions, unless you are looking for children or you are in a stable trustworthy non-promiscuous relationship.
What’s the point? Sperm has a pH of 7.39. When the quantity of sperm per ejaculation is abundant (say 6-7 ml instead of the normal 2-4), the vaginal pH increases temporarily, predisposing to vaginal dysbiosis and increased growth of anaerobic bacteria such as the Gardnerella Vaginalis, and this is the germ that produces bad smell, bad scent. If intercourses are frequent, then this clearly contributes to persistent vaginal dysbiosis, leakage and bad odor. Condom use is an easy and very effective protective measure.
Key message: consistent condom use is also the very first protection against sexually transmitted infections and diseases.
So, sex can be enjoyed frequently, with lots of pleasure and joy, if consistent condom use becomes your best self-protective strategy.
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