Do you have any children together? One of the the main results of allergy to sperm is inability to conceive because the woman's body literally kills the sperm. So, if you conceived your children easily, it is doubtful that you have an allergy to your husband's sperm. It is more likely that you suffer from a yeast infection/ thrush, which is common for women and which can be easily treated.

you might be allergic to your husbands sperm. im just guess, but i read a women was itchy, just like you after having sex with her husband.
there are ways that can help you if this is your case.
i m going to private message you the website.