Boyfriend always smells his fingers after sex

So when me and my boyfriend have sex he always fingers me first or during but after he is always smelling his fingers as though i smell? I always shower before I have sex and I can never smell anything but makes me paranoid sometimes I even try to duck his fingers during sex so they smell more of my breath than anything else 😂but I don’t feel like I smell and my fingers never smell if I touch myself so I don’t know why he does this. is this normal