Spider behaviors include oral sexual encounters
Tough Love: Male Spiders Die for Sex | Spider Sex | Live Science
Image of the Day: 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.
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.