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Why are Tipulidae legs so long ?

This is what I always ask myself when I see one. The legs seem clearly oversized to be useful, and they seem the main reason for their slow flight.

http://www.fotonatura.org/galerias/foto.php?id_foto=121116&id_galeria=371

IMHO, as such long legs seem useless, they must be related with reproduction.

A friend suggested me that for females the long legs provide oportunities for putting the eggs in better locations in wet vertical surfaces. Males need the long legs for copulation.

Is this a correct explanation ?