Use love potions?

Can you short-cut all the hard work of relationship-building by artificial means? People have been trying to crack this one for thousands of years. A nasal spray containing the hormone oxytocin can make people trust you - an important part of any relationship - though there's no evidence yet to suggest it can make someone fall in love. And while we wouldn't suggest you try this at home, studies on prairie voles show that injecting the hormone vasopressin into the brain makes males bond strongly to females. Illegal drugs such as cocaine or amphetamines can simulate the euphoria of falling in love by raising levels of the neurotransmitter dopamine, but dopamine levels can also be increased legally by exercising. Another neurotransmitter, phenylethylamine (PEA), is tagged the "love molecule" because it induces feelings of excitement and apprehension. PEA is found in chocolate and it, too, is linked to the feel-good effects of exercise. Overall, a swift jog could be more conducive to love than anything you might find in a bottle.