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The human sexual response cycle is a four-stage model of physiological responses to sexual stimulation, [1] which, in order of their occurrence, are the excitement, plateau, orgasmic, and resolution phases. This physiological response model was first formulated by William H. Masters and Virginia E. Johnson, in their 1966 book Human Sexual Response.
Human reproduction is sexual reproduction that results in human fertilization to produce a human offspring. It typically involves sexual intercourse between a sexually mature human male and female. [1] During sexual intercourse, the interaction between the male and female reproductive systems results in fertilization of the ovum by the sperm to ...
This behavior lasts anywhere between 8 and 30 hours at a time. [26] Other behaviors of the female during standing estrus may change, including, but not limited to: nervousness, swollen vulva, or attempting to mount other animals. [26] While visual and behavioral cues are helpful to the male cattle, estrous stages cannot be determined by the ...
Human sexuality. Human sexuality is the way people experience and express themselves sexually. [1] [2] This involves biological, psychological, physical, erotic, emotional, social, or spiritual feelings and behaviors. [3] [4] Because it is a broad term, which has varied with historical contexts over time, it lacks a precise definition. [4]
r / K selection theory. A North Atlantic right whale with solitary calf. Whale reproduction follows a K -selection strategy, with few offspring, long gestation, long parental care, and a long period until sexual maturity. In ecology, r/K selection theory relates to the selection of combinations of traits in an organism that trade off between ...
Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete ( haploid reproductive cells, such as a sperm or egg cell) with a single set of chromosomes combines with another gamete to produce a zygote that develops into an organism composed of cells with two sets of chromosomes ( diploid ). [ 1]
The mammalian female reproductive system contains three main divisions: the vagina and uterus, which act as the receptacle for the sperm, the ovaries, which produce the female's ova, and the vulva, which consists of the labia, vestibule and clitoris. The vagina, uterus and ovaries are always internal while the vulva is external.
Mating system. A mating system is a way in which a group is structured in relation to sexual behaviour. The precise meaning depends upon the context. With respect to animals, the term describes which males and females mate under which circumstances.