When his semen makes you burn—but not with desire.
A semen allergy is caused by an allergic reaction to a particular protein in semen. ... On the other hand, a semen allergy can be there from the start. Symptoms include burning and itching. While a semen allergy isn't totally rare, it's not particularly common.
Contact with semen during sex can sometimes disrupt the natural environment in the vagina, triggering thrush. Using condoms can prevent this effect.
Vaginitis isn't a sexually transmitted infection. But sometimes sexual activity can lead to vaginitis. Your partner's natural genital chemistry can change the balance of yeast and bacteria in your vagina. In rare cases, you can have an allergic reaction to your partner's semen.