For instance, in the Philippines, a wife can be charged with the crime of adultery (for merely having one act of sexual intercourse with a man other than her husband), while a husband can only be charged with the related crime of concubinage, which is more loosely defined (it requires either keeping the mistress in the family home, or cohabiting with her, or having sexual relations under scandalous circumstances).A breach of this expectation of fidelity is commonly referred to as adultery or extramarital sex. Historically, adultery has been considered a serious offense, sometimes a crime. Even if that is not so, it may still have legal consequences, particularly a divorce. Adultery may be a factor to consider in a property settlement, it may affect the status of children, the custody of children, etc. See also
Cuckold
Female husband
Husband-selling
Hypergamy
Polyandry
Polygamy in Christianity
Wife

References
Further reading
Wedgwood, Hensleigh (1855). "On False Etymologies". Transactions of the Philological Society (6).
Clinical significance
Disease
Spina bifida is a congenital disorder in which there is a defective closure of the vertebral arch. Sometimes the spinal meninges and also the spinal cord can protrude through this, and this is called spina bifida cystica. Where the condition does not involve this protrusion it is known as spina bifida occulta. Sometimes all of the vertebral arches may remain incomplete.Another, though rare, congenital disease is Klippel–Feil syndrome, which is the fusion of any two of the cervical vertebrae. Spondylolisthesis is the forward displacement of a vertebra and retrolisthesis is a posterior displacement of one vertebral body with respect to the adjacent vertebra to a degree less than a dislocation. Spondylolysis, also known as a pars defect, is a defect or fracture at the pars interarticularis of the vertebral arch. Spinal disc herniation, more commonly called a "slipped disc", is the result of a tear in the outer ring (anulus fibrosus) of the intervertebral disc, which lets some of the soft gel-like material, the nucleus pulposus, bulge out in a hernia. Spinal stenosis is  a narrowing of the spinal canal which can occur in any region of the spine though less commonly in the thoracic region. The stenosis can constrict the spinal canal giving rise to a neurological deficit. Pain at the coccyx (tailbone) is known as coccydynia.Spinal cord injury is damage to the spinal cord that causes changes in its function, either temporary or permanent.