Underpads are protective liners used to protect certain surfaces from liquids. They are commonly made for chairs, wheelchairs and mattresses. A chair is a kind of Furniture for Sitting, consisting of a back and sometimes arm rests commonly for use by one person A wheelchair is a wheeled Mobility device in which the user sits A mattress is a mat or pad usually placed atop a Bed, upon which to sleep or lie Protecting mattresses from fluids including but not limited to semen, sweat, urine and vaginal fluid is the job of an underpad designed for a mattress, where as the name of the game with wheelchairs and chairs is more protection from drink spills. Physiological aspects Internal and external fertilization Depending on the Species, spermatozoa can fertilize Urine is a liquid waste product of the body secreted by the Kidneys by a process of filtration from Blood and Excreted through the Urethra. Vaginal lubrication is the naturally produced lubricating fluid that reduces friction during Sexual intercourse. They contain the fluids via absorption
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