I am all of a sudden getting frequent yeast infections. Could oral sex be the culprit?

Hello everyone, I've been dealing with recurring yeast infections for the past month, which is unusual for me. Despite trying to stay dry in the hot weather, I've noticed itching near my perineal and anal areas after being intimate with my boyfriend. I always ask him to brush his teeth before sex, but I'm wondering if his mouthwash might be causing issues. He uses a Therabreath Invigorating mint mouthwash, but I'm considering suggesting an antibacterial mouthwash or a salt water rinse before oral sex. Sometimes, he will spit on my vagina during oral sex or penetrative sex which I think might be an issue as well. I make sure to clean myself after sex and I take women probiotics every day so I don’t understand why this keeps happening. There isn’t any strange discharge so I’m not even sure if it’s really a yeast infection or just irritation.

I'm seeking advice from anyone who has experienced something similar or has suggestions on how to handle this situation. Your input would be greatly appreciated. Thank you in advance!