My girlfriend does have pain when I ejaculated into her.

The main question I have is, if my sperm is the cause for this or her five vaginal fungal infections in the past ?

She said, that she had 5 BV with another sex partner and now get pain when she is in contact with my sperm.

I also had other sex partners before her and no one of them had pain after sex.

I also have no fungal infections in my genitals.

Is there anyway the possibility, that my sperm is root cause for this ? If she is now allergic to sperm or something like this ?

Thank you so much...