Virility
Virility (from the Latin virilitas, manhood or virility, derived from Latin vir, man) refers to any of a wide range of masculine characteristics viewed positively. Virile means "marked by strength or force".[2] Virility is commonly associated with vigour, health, sturdiness, and constitution, especially in the fathering of children. In this last sense, virility is to men as fertility is to women. Virile has become obsolete in referring to a "nubile" young woman, or "a maid that is Marriageable or ripe for a Husband, or Virill".[3]
Historically, masculine attributes such as beard growth have been seen as signs of virility and leadership (for example in ancient Egypt and Greece).[1]
Male virility
Evidence shows that increased male age is associated with a decline in semen volume, sperm motility, and sperm morphology.[4] In studies that controlled for female age, comparisons between men under 30 and men over 50 found relative decreases in pregnancy rates between 23% and 38%.[4]
Older men have lower semen parameters resulting in lower fertility potential. The effects of aging on semen quality are summarized below based on a study of 1,219 subjects:[5]
| Age group (years) | Number of subjects (n) | Volume (ml)
[min–max] |
Total Sperm count (million)
[min–max] |
Motility (grades a + b) (%)
[min–max] |
Morphology (%)
[min–max] |
|---|---|---|---|---|---|
| 21–28 | 57 | 2.9±1.3
[1.0–6.0] |
144.3±138.0
[0.2–414] |
47.5±25.4
[0–88] |
26.1±13.3
[0–49] |
| 29–35 | 450 | 2.7±1.5
[0.2–8.0] |
149.5±173.7
[0.1–1358] |
48.1±30.4
[0–95] |
24.8±15.7
[0–55] |
| 36–42 | 532 | 2.5±1.5
[0.4–10.5] |
120.4±156.7
[0.2–949] |
40.0±27.1
[0–83] |
23.1±15.9
[0–56] |
| 43–49 | 165 | 2.4±1.4
[0.1–8.0] |
112.3±142.7
[0.2–776] |
33.1±25.1
[0–84] |
23.0±16.5
[0–60] |
| 50–60 | 15 | 1.7±1.1
[0.5–4.5] |
61.0±91.1
[0.1–329] |
31.3±23.9
[0–59] |
19.7±14.5
[0–37] |
- In males 20–39 years old, 90% of the seminiferous tubules contain mature sperm.
- In males 40–69 years old, 50% of the seminiferous tubules contain mature sperm.
- In males 80 years old and older, 10% of the seminiferous tubules contain mature sperm.[6]
Research shows increased risks for health problems for children of older fathers. A large-scale Israeli study found that the children of men who were 40 or older were 5.75 times more likely than children of men under 30 to have an autism spectrum disorder, controlling for year of birth, socioeconomic status, and maternal age.[7] Increased paternal age has also been correlated to schizophrenia in numerous studies.[8][9][10]
Researchers have found evidence to suggest overweight and obesity may cause subtle damage to sperm and prevent healthy pregnancy. They say fertilization was 40% less likely to succeed when the father was overweight.[11]
The
See also
- Fertility
- Muliebrity
- Machismo
- Masculinity
- Physical strength
- Virilization
- Virtus
- Vīrya (Hinduism) (Sanskrit term for the same)
References
- ^ a b Schiebinger 1993
- ^ Oxford English Dictionary
- ^ Oxford English Dictionary
- ^ PMID 11172821.)
{{cite journal}}: CS1 maint: multiple names: authors list (link - ^ Kumar, M.D., Naina; Singh, M.D., Amit; Choudhari, M.D., Ajay R (August 2017). "Impact of age on semen parameters in male partners of infertile couples in a rural tertiary care center of central India: A cross-sectional study". International Journal of Reproductive Biomedicine. 15 (8).
- ^ " Effect of Age on Male Fertility" Seminars in Reproductive Endocrinology. Volume, Number 3, August 1991. Sherman J. Silber, M.D.
- PMID 16953005.
- PMID 11296097.
- PMID 15501901.
- PMID 11920852.
- ^ "Obesity | Fat men linked to low fertility". Sydney Morning Herald. 18 October 2010. Retrieved 19 October 2010.
- S2CID 19875208.)
{{cite journal}}: CS1 maint: multiple names: authors list (link - ^ "Age Limit of Sperm Donors in the United Kingdom", PDF file
Further reading
- Schiebinger, Londa (1993), Nature's Body, Boston, Massachusetts: Beacon Press