During times of physical separation, when touching and caressing is impossible, a deep, longing, almost a hunger, for the beloved can set in. We are used to thinking of this longing as only psychological, but it's actually physical. The brain is virtually in a drug-withdrawal state. During a separation, motivation for reunion can reach a fever pitch in the brain. Activities such as caressing, kissing, gazing, hugging, and orgasm can replenish the chemical bond of love and trust in the brain. The oxytocin-dopamine rush once again suppresses anxiety and skepticism and reinforces the love circuits in the brain. From an experiment we also know that oxytocin is naturally released in the brain after a twenty-second hug from a partner- sealing the bond between huggers and triggering the brain's trust circuits.