Fragrance refers to a unique aroma or smell.
As most people have different opinions as well as likes and dis-likes, the same can be said of smell.
What may make one person weak at the knees from infatuation. Could have the same physical effect on another person yet for a different reason as the second person may be ready to hurl.
The trick when buying perfume or any body fragrances is to choose what reacts well with your own body chemistry. Whos smell is both pleasing to you as well as appealing to your partner. The first part is very simple to work out. Spray or rub some of it on and take it for the sniff test. If you find yourself going mmm rather than jerking your head away then that fragrance is something that you can live with.
Your partner is a bit different. Though it is pretty easy to tell from thier reaction whether or not the fragrance is appealing to them. After you have been with someone for a while it is reasonably easy to tell what they like, if you have been paying attention to which fragrances had what affect on them in the past.