I can definitely sympathize with "ruined" fragrances. For me, my ex took Creed's Silver Mountain Water and Givenchy's Pi. Rargh.
I can't say that I demand potential boyfriend to be fragrance obsessed. That's mostly because it's such a rarity for straight dudes (sorry, straight dudes). It would definitely be a turn-on though, and BO is totally a gamekiller for me too unless it's light and somehow really good BO.