Well there is not much monogamy in the spider world, but the look of a male daddy long legs spider standing guard over eggs is irresistible to the females. Apparently the female daddy long legs spider will gravitate towards males that are guarding eggs because it makes them think that he will guard her eggs too.
It does not pay to be a deadbeat dad in the community of daddy long legs. A male that abandons his duty toward protecting the eggs that he helped produce will not be in very high demand as far as mating goes. Male spiders will sometimes give up on looking after its unborn offspring because the male needs to find food. But there are other males who stick around, even as long as four months.
A male spider will continue to mate while he is standing guard over eggs. After a while a male might find itself protecting a bunch of eggs that belong to different mothers. If the male happens to be standing guard in an area that is plentiful with food he will have no reason to leave. Naturally a female prefers this type of male since her offspring will most likely get a chance to prosper as long as they think that the male will not abandon the eggs. This sexual preference, and the behavior associated with it, has been noted in many other animals as well.
Do female mammals consider the likelihood of abandonment when choosing mates? And how?