Now, Amortentia doesn't create actual love, that would be impossible. But it does cause...

[after Hermione explains the properties of a love potion] Horace Slughorn: Now, Amortentia doesn't create actual love, that would be impossible. But it does cause powerful infatuation or obsession, and for that reason... it is probably the most dangerous potion in this room. [Sure enough, all the witches in the room have been drifting towards the cauldron, staring into the steam, until Slughorn puts the lid on, and they snap back to themselves. Or were they imagining all the things they could do with it if they had it]