Just to throw another little wrinkle into the mix, I believe Love is a quality a person has, or does not have and can be difficult to attain based on a persons history. Oftentimes, Love is a space one enters and withdraws from depending upon what is happening around them. You can be in that place even when alone but it is magnified when you are with another who is in the same space at the same time. Because Love is not limited to only the physical realms, when a person is in the space of Love, they can see deeper and further. When you encounter another in the same space, there is an instant attraction from which a ongoing relationship may or may not develop.
The trick is to be in the space of Love as often as possible, than you will be drawn to others embodying the same quality. This does not mean, you will have a intimate, long lasting relationship with every one of them, only that you will relate to them on a higher level and that can occur at first sight.