Sexual disease video
In humans and bonobos, the female undergoes relatively concealed ovulation so that male and female partners commonly do not know whether she is fertile at any given moment.
One possible reason for this distinct biological feature may be formation of strong emotional bonds between sexual partners important for social interactions and, in the case of humans, long-term partnership rather than immediate sexual reproduction.
Religious views on sexuality vary significantly between different religions and sects of the same religion, though there are common themes, such as prohibition of adultery.
Reproductive sexual intercourse between non-human animals is more often termed copulation, and sperm may be introduced into the female's reproductive tract in non-vaginal ways among the animals, such as by cloacal copulation.
they might alternatively be considered a means of maintaining virginity (sometimes called "technical virginity)" or labeled "outercourse", regardless of any penetrative aspects; this is more often the case for oral sex than for anal sex.
Studies regarding the definition of sexual intercourse sometimes conflict.