Scientists believe that oxytocin is the hormone behind attachment.It is a bonding chemical that is released during sex.Mutual attachment is what makes a couple work things out after arguments and when a couple has sex often, it deepens the bond due to the release of oxytocin.

Humans detect good mating hormones, including pheromones, via the senses, especially the sense of smell and taste.

On a conscious level, this is when people are finding out what interests they have in common.

Becoming attached to each other is another sign of mutual love.

There are different hormones at work during the process of two people who are falling for each other.

It's typically driven by the desire to reproduce, and finding the right match often is demonstrated by showing signs of mutual love for each other. Scientists believe that dopamine, adrenaline and serotonin all come into play in this stage of love.

During this stage, couples are mutually attracted to each other and keep entering into each other's thoughts.

The chemicals in the brain can make the heart beat faster when they are together.

Dopamine allows the human body to function with less sleep and increased energy.

This also is the stage where sexual attraction is driven by testosterone and estrogen.