He says he's starting to smell like me!

Everything you say rings true to me - your doctor was spot on. I know from my work on body language that liking each other's smell is a key signal that you are attracted by each other's genes, and on every level, that's good news.

Equally, acquiring each other's smell will mean that you are starting to 'match' each other, in the same way as you will have started to match gestures, voice patterns, and even some physical vulnerabilities. (Watch as how you start to copy each other's posture, both of you end up with the same back problems!)

Of course, the fact that your genes want to mingle means solely that from a physical point of view you'd produce great, healthy babies - not that your personalities necessarily suit. Matching each other smell-wise simply means that you are getting on well at present, not necessarily that you're compatible in the longer term.

If you end up separating, don't think that the theory is wrong. In fact, if you find that you are suddenly starting to smell bad to one another - and you've ruled out halitosis and illness - actively use the theory to explore what is happening. If you're still happy together, fine, but if you're hitting problems, maybe your physiology is trying to tell you that. I'm not the only woman on earth to have found that as love started to falter, I found my partner's smell not quite so appealing.

Why not chat to other iVillagers on the Couples message board. Take a look at some of the LIVE discussions taking place on the message board right now: