There's two schools of thought on this, Eastern (Asia, Middle East, tribal countries) and Western (W. Europe, Canada, United States) No suprise here. Since 9-11 we've been hearing a lot about East v West, haven't we?
Eastern cultures believe sex is an ACT, reserved privately for the bedroom...
HINDUISM
This is the sum of duty: do not do to others what
would cause pain if done to you
(Mahabharata 5:1517)
BUDDHISM
Treat not others in ways that you yourself woud find
hurtful
(Udana-Varga 5.18)
CONFUCIANISM
One word which sums up the basis of all good conduct...