Weird fishy smell after sex

I notice a weird “fishy” smell after my boyfriend cums in me. Sometimes it lasts for days and I hate it.

I don’t smell or have any problems until after he ejaculates inside me. It’s normally worse the next day or the next morning. What can I do to prevent the horrible smell?

Does anyone else have this problem??

I talked to a friend and she mentioned that it might be his diet and he should drink pineapple juice??

Keep in mind, neither of us have an STI/STD.

We are each other’s first everything. Haven’t been with any other partners