Not done Sir, but doing.

Plenty is doing.

"Professor Lykken {1993, J. Person. & Soc. Psychol.} questioned more than 900 pairs of twins and their spouses about their love life, with surprising results. It turns out that the partners of pairs of twins are, on average, barely more alike than any other two adults passing in the street.... most cases one twin did not particularly like (or dislike) their twin's mate; and the partners of twins did not like or dislike the [other] twin any more than someone might like the partner of a friend. "As far as we can see," says Professor Lykken, "whom people fancy and then marry is not governed by any logical rules.... At best, similarity in things like age, education, attractiveness and political leanings narrows the field of suitable candidates by about 50 per cent.""

Jerome BURNE, 1993, The Independent, 9 ii.

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