'boy' isn't really an opposite, is it, of 'girl.' Yet they are biologically different

Don't know what the word is Wordwind*, but this dichotomy ["muliebrity" - "virlility"] begs the question:

Do opposites really attract?

Opposite qualities may connect people, but that isn't what keeps them connected, apparently:

Opposites may attract, but it is their personalities that matter
The Scotsman, February 15, 2005

Extract:

Researchers from the University of Iowa looked at 291 couples who had taken part in a marriage study less than a year after tying the knot.

All were assessed on a wide range of personality characteristics, attitudes and relationship quality indicators.

There was no evidence that personalities of a feather flocked together - and nothing to show that opposites attract.
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... once people are in a committed relationship, it is primarily personality similarity that influences marital happiness, because being in a committed relationship entails regular interaction and requires extensive co-ordination in dealing with the tasks, issues and problems of daily living."

http://news.scotsman.com/health.cfm?id=172682005

* Maybe it's a pairadox. Who can figure out how men and women fit together anyway? Who was it who finally gave up on the whole effort saying "Women, can't live with them, can't live without them."* :)

* It was the philosopher Desiderius Erasmus, 1466 - 1536, who also said:

The most disadvantageous peace is better than the most just war.

http://snipurl.com/ctuk