smell of cum leaking after sex

ok so early Sunday morning around 6am me and my SO had sex. Today i have this discharge that only happens when he nuts inside me, it has this smell to it that is hard to explain it’s like a weird stinky musty kind of rotten but not rotten smell idk🤣its not a infection or anything i got checked when it happened the first time. Does anyone know how to get rid of it or what it might be ? ( i did pee and wipe up afterwards) added a pic