
Anyway, that had me reflecting on love and thinking about how effing useless psychology is when it comes to these important things. We probably learn more from the language around love. For example we have
- "falling in love" which is suggestive of its involuntary and random nature (as when we fall over an obstacle)
- "love struck" much the same
- "love is blind" which is probably a reference to 'blind eye' but in effect says it is hard to predict
- "love sick" which captures its rather overwhelming visceral effects
The first three support the view that love "just happens", can't be hurried along, and can't be engineered.
So what, and perhaps more important, why is love?
We already like to have sex, a handy side effect of which is reproduction, so love doesn't seem to be a necessary condition for anything. But it's here. How come? Well it's a biological truism that we fall in love because those people who did, in the geological past, had better breeding success than those that did not.
Which is interesting.
Perhaps it has to do with what Desmond Morris called "pair bonding". Pair bonding keeps the breeding couple together for all those years it takes to get offspring from infancy to independence. Falling in love initiates the bond, which is then supported and maintained by lashings of sex over the years. Well, quite, but it's true you know. Nothing in the animal kingdom goes in for bonking as we do.
Anyway, none of this gets me nearer to mud and love, so I'll take my chances and move on to what I think it's all about:
attraction -> approach -> reciprocity -> sex -> love (then lots more sex, but we've been there already)
Or for the more romatically inclined, reverse the last two.
First, attraction. Now this is a real mystery. I think we all know that sudden jolt when you find someone attractive; but could we define what it is? Hard for any one of us I suspect but science does provide some clues.

Why? Most faces are slightly asymmetrical; the more symmetrical a face is, the more attractive it is judged. Apparently symmetrical faces are advertising hordings that say "I've got good genes, choose me". And the morphing process tends to balance out asymmetries.
Another thing that has men interested is the waist-to-hip ratio. You measure your waist at the narrowest point and your hips at the widest point and get the ratio waist/hips. A ratio of 0.7 seems to be rated universally as the most attractive which is interesting because that is the best predictor of fertility. Apparently Marilyn Monroe had it as does the skinnier Kate Moss.

And so amazingly does the classic Coke bottle; I did some consumer research that showed men find it attractive. Sad buggers.

There is much else; have a look at this article on attraction.
I personally think that attraction is a must. But I have a friend who has been married for 35 years and has grown-up children. He married because their families kind of expected them to. There was really no attraction or love, I don't think.
Next, check that it is reciprocated. It may not be, but that's not the end. I've known people become attracted later, as it were, a kind of catastrophe switch from non-attraction to attraction. I think that sex itself can cause this to happen, but don't do it just because I said so.
If the attraction is mutual you are kind of home and dry. If not, it's uphill work, and in the end unrewarding.
Well, I say home and dry, but that's not quite true. The suggestion is that the more alike the two of you are in background, social standing, education, economics and even genetics, the more likely the relationship is to succeed (boring, but there you go).
Based on my own experience I would say that if it turns out your love is not reciprocated, cut and run no matter how attractive you find them. You may be unhappy now, but boy are you going to be unhappy later if you don't.
Anyway, I think this is why people say well it just comes along, you don't know when, then bam etc etc. The whole attraction thing is very statistical (symmetry and various ratios notwithstanding).
So for two people to get the hots for each other at the same time is just improbable - though completely possible. It just takes time. If you think it is happening, then go for it, and be prepared to make the running.
Postscript: This post was much harder to write than I thought. And a whole lot less useful. But it's late and I'm off to bed.