Why Odor Changes After Sex (and when it’s not normal)
Odor changes after sex are common. The reason is usually boring: pH.
Quick links (if you’re in a hurry):
Fishy vs onion vs ammonia smell: what each usually means
BV vs yeast vs trich: the quick difference guide
The main reason: semen changes pH
Semen is more alkaline. The vagina is naturally acidic. After sex, that temporary pH change can shift odor for 24–48 hours.
Other common reasons
Sweat + friction (especially with longer sex or workouts after)
Condoms/lube (some people react to ingredients)
Oral sex (saliva can also affect pH)
Period timing (your cycle already changes pH)
When it’s not normal
If odor after sex is:
getting worse over time
coming with burning/itching
paired with discharge changes
showing up basically every time
…it could be BV, yeast, or trich.
What to do (simple)
Pee after sex
Wash the outside with water only (skip scented soap)
Cotton underwear
If it keeps happening: get tested so you’re not treating the wrong thing
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