Spider sex

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By: Tom Harris. 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.
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The ungentle joy of spider sex

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Sex differences in spiders: from phenotype to genomics | SpringerLink

Sexual reproduction is pervasive in animals and has led to the evolution of sexual dimorphism. In most animals, males and females show marked differences in primary and secondary sexual traits. The formation of sex-specific organs and eventually sex-specific behaviors is defined during the development of an organism. Sex determination processes have been extensively studied in a few well-established model organisms. To reveal the mechanisms underlying the development of sexual dimorphism and to identify the evolutionary forces driving the evolution of different sexes, sex determination mechanisms must thus be studied in detail in many different animal species beyond the typical model systems. We show that spiders are sexually dimorphic in various morphological, behavioral, and life history traits. The availability of an increasing number of genomic and transcriptomic resources and functional tools provides a great starting point to scrutinize the extensive sexual dimorphism present in spiders on a mechanistic level.
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Spider behaviors include oral sexual encounters

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Filmmakers capture the false widow spider's slightly strange and downright dangerous mating technique. Being as likely to end up a meal as a mate is only the beginning of a spider's bizarre approach to sex. Males don't possess a penis in the traditional sense. Instead their anatomy includes a pair of appendages called pedipalps, which are much larger in males and have syringe-like enlarged ends. Once a male spider finds a receptive female, he deposits sperm on a sperm web before charging his pedipalps with it.
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