There are currently 3 names in this directory beginning with the letter M.
Male (Man)
Biological term for those who have a Y chromosome, which codes for the production of larger amounts of testosterone to develop male reproductive organs. In most animals, including humans, sex is determined genetically, but in some species it can be determined due to social, environmental, or other factors. Also, a term of self-identification as referenced to gender/roles and or expression.
Masculinity
Also called boyhood, manliness, or manhood is a set of attributes, behaviors and roles generally associated with boys and men. Masculinity is both socially-defined and biologically-created. It is distinct from the definition of the male biological sex. Both males and females can exhibit masculine traits and behavior. Those exhibiting both masculine and feminine characteristics are considered androgynous, and feminist philosophers have argued that gender ambiguity may blur gender classification. Traits traditionally cited as masculine include courage, independence and assertiveness. These traits vary by location and context, and are influenced by social and cultural factors. An overemphasis on masculinity and power, often associated with a disregard for consequences and responsibility, is known as machismo.
MSM
Literally, men who have sex with men. Term created in the 1990's to cover those men who have intercourse with others of their gender but do not, for whatever reason(s), identify with the terms "homosexual or gay". This marketing campaign is/was a strategy to mainly attract those males of colour towards HIV prevention and treatment programs.