Incest is defined as sexual intercourse between closely blood-related individuals such as fathers and daughters, brothers and sisters. Incest between these close relatives is common and usually involves psychological factors. In India, incest itself is not a criminal offense. Incest may occur between mentally defective individuals unable to understand the taboo, when alcohol removes inhibitions, in cases of cerebral disease, or when closely related individuals are separated for long periods and reunite as strangers. Adultery, defined as sexual intercourse without consent between a man's wife and another man, is punishable by up to five years imprisonment, though the wife would not be considered an abettor.

1. INCEST

2. Incest me an sexual intercourse by men with
women who is closely related to him by blood.
 E.g. , a daughter, granddaughter, sister, stepsister,
aunt or mother.
 Incest between father & daughter and brothers and
sisters are common.
 These cases usually have psychological features.
 In India, incest as such, is not an offence.


3. INCEST OCCUR
Between mental defectives who are unable to
understand the prohibitions against it, or whose
feelings are too strong to inhibit them behaving in
this way.
 Where alcohol removes the natural inhibitions.
 In case of cerebral disease, such as general
paralysis, senile cerebral degeneration, etc.
 Where a brother and sister have been separated
since childhood or for a long period and meet later
as strangers.
 Where close relations have to live in intimacy.


4. 
Sexual intercourse with the wife of another man,
without the consent or connivance of that man
constitutes adultery. It is punishable with
imprisonment up to five years. In such a case, the
wife shall not be punishable as an abettor.