Spidersex.it

Males and females of some spider species differ hugely in size. The most extreme examples of such sexual size dimorphism are among the orb weaver spiders. For the tiny male golden orb weaver Nephila pilipes , approaching the female is fraught with peril: She can be 10 times his length and times heavier. Some spiders pair puny males with gigantic females, making mating both tricky and dangerous. Why and how such mismatches evolved remains curiously enigmatic.
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BBC - Earth - The weird world of spider sex

The male spider's primary objective in life is to impregnate one or more female spiders before other males can. As it turns out, this is no easy task in most species. The first obstacle is actually finding a female spider. Most spider species are completely solitary animals, meaning they live and feed on their own, and they are generally spread out over a wide area, making an available female relatively scarce. The male spider has the daunting task of tracking down a sexually mature, receptive female in the area before other males can get there. In most species, the female makes it easier on the males by "advertising" herself with pheromones , communicative chemicals.
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The ungentle joy of spider sex

Spiders and their mating systems are useful study subjects with which to investigate questions of widespread interest about sexual selection, pre- and post-copulatory mate choice, sperm competition, mating strategies, and sexual conflict. Conclusions drawn from such studies are broadly applicable to a range of taxa, but rely on accurate understanding of spider sexual interactions. Extensive behavioural experimentation demonstrates the presence of sex pheromones in many spider species, and recent major advances in the identification of spider sex pheromones merit review. Synthesised here are the emission, transmission, structures, and functions of spider sex pheromones, with emphasis on the crucial and dynamic role of sex pheromones in female and male mating strategies generally. Techniques for behavioural, chemical and electrophysiological study are summarised, and I aim to provide guidelines for incorporating sex pheromones into future studies of spider mating.
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