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Overall, evolutionary account would highlight that out need for private sex is related with growth for security, the extension of shame, and the evolution of modesty.
Along the same line, Malinowski (1927) also points out that sexual intercourse in public could excite jealousy and would be an indicator to invite rivals to seize that which is being enjoyed. According to Donald Symons (1979) "The evolution of human sexuality", it is a species specific adaptation that seems to be universal across cultures.
Afther this remark, the author suggests a possibility that "the vases are just as unrealistic as modern pornography" but also offers a way to counter that claim.
There is a little more on that subject in the article itself.
public sex), but it doesn't apply in other social conditions.
@Piotr Migdal specified that he is mainly interested in the issue of "unwillingness to have sex in public".
We can trace the origin of such 'unwillingness' to the sense of shame that could be explained from evolutionary standpoint.
For example, Maccurdy (1930) boldly pointed out that postures during both sexual intercourse and excretion prevents people from rapid self-defence.
Malinowski (1927) writes that: In this context, the sense of shame could have developed as a response to natural drive for self-protection (Dawrin, 1872; Maccurdy, 1930).On the other hand, Ryan & Jethá (2010) "Sex at Dawn" argues that humans are not by nature sexually exclusive, although I don't think they explained why people around the world generally have sex in private.