This will sound really stupid, but honestly I don't feel much sympathy for her being infertile due to an STD, unless she was too drunk to realise that he wasn't using protection because honestly it's difficult to enforce when blackout drunk, i'm surprised everything in my body is still functioning after mad drunk one night stands.
Honestly, if the guy said he's allergic to condoms, it's usually latex that does it, there are latex free options available at local shops, because a latex allergy is fairly common, i mean a fair few people i know are allergic.
It may seem really heartless of me to say so, but STDs are preventable, especially common ones like chlamydia and gonorrhea (which can also be treated if you know it's there early enough).