Gender is the range of characteristics pertaining to, and differentiating between, femininity and masculinity. Depending on the context, these characteristics may include biological sex , sex-based social structures i. Some societies have specific genders besides "man" and "woman", such as the hijras of South Asia ; these are often referred to as third genders and fourth genders , etc. Sexologist John Money introduced the terminological distinction between biological sex and gender as a role in Before his work, it was uncommon to use the word gender to refer to anything but grammatical categories. Today, the distinction is followed in some contexts, especially the social sciences   and documents written by the World Health Organization WHO.
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Personal lubricants colloquially termed lube are specialized lubricants used during sexual acts , such as intercourse and masturbation , to reduce friction to or between the penis and vagina , anus or other body parts or applied to sex toys to reduce friction or to ease penetration. Surgical or medical lubricants or gels, which are similar to personal lubricants but not usually referred to or labelled as "personal" lubricants, may be used for medical purposes such as speculum insertion or introduction of a catheter. The primary difference between personal and surgical lubricants is that surgical lubricants are thicker, sterile gels, typically containing a bacteriostatic agent. Water-based personal lubricants are water- soluble and are the most widely used personal lubricants. The earliest water-based lubricants were cellulose ether or glycerin solutions. Products available today may have various agents added for even dispersal, moisture retention, and resistance to contamination.
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