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The various phases of the life cycle were described by David Lancy [2] as belonging to six practical categories: 1) Birth and early infancy, which Lancy describes as ritually being the least important given the doubt over the child's survival; 2) Joining the community when the infant's survival is confirmed, usually denoted by a naming ceremony ...
"[initiation's] function is to reveal the deep meaning of existence to the new generations and to help them assume the responsibility of being truly men and hence of participating in culture." "it reveals a world open to the trans-human, a world that, in our philosophical terminology, we should call transcendental."
Ulwaluko, traditional circumcision and initiation from childhood to adulthood, is an ancient initiation rite practised (though not exclusively) by the Xhosa people, and is commonly practised throughout South Africa. The ritual is traditionally intended as a teaching institution, to prepare young males for the responsibilities of manhood. [1]
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.
This has shaped human evolution for many years, but reasons why humans choose their mates are not fully understood. Sexual selection is quite different in non-human animals than humans as they feel more of the evolutionary pressures to reproduce and can easily reject a mate. [ 2 ]
For the advantage due to genetic variation, there are three possible reasons this might happen. First, sexual reproduction can combine the effects of two beneficial mutations in the same individual (i.e. sex aids in the spread of advantageous traits) without the mutations having to have occurred one after another in a single line of descendants.
To understand whether any humans alive today still have these Neanderthal genetic variants and how they function, the researchers looked at the UK Biobank, a medical database that has genetic and ...
Hormonal control of spermatogenesis varies among species. In humans the mechanism is not completely understood; however it is known that initiation of spermatogenesis occurs at puberty due to the interaction of the hypothalamus, pituitary gland and Leydig cells.