I'm with Dolfette on this one...
I don't know if it's a mental thing with me or not, because I absolutely detest cum, everything about it, but I can smell it whether it's in me or on me, no matter how much I shower/bath, I can still smell it.
I'm not so bad with normal vaginal smells, aside from during periods... I don't just smell my own, I can smell other peoples too, no matter how clean the person is, when they last changed whatever their chosen product is, I can smell it and it drives me up the damn wall.
No one else seems to notice though, I've asked others if they could smell it after female friends have left, they couldn't. My husband doesn't have a bloody clue (hehe) when my periods have started... Maybe my nose just hates me!