I agree with Vhotee that there are some cultures where this kind of act will take place more often. Culture like ours or that of arabic world separates women and men from early age. Boys hang out with boys and girls hang out with girls. Even feelings of attraction and love during adolescence are suppressed because in our culture it is almost seems abnormal to fall in love since the future partner will be arranged and decided by the family.
The result of this can clearly been seen in any gatherings where men tend to stick with men and w omen with women. Since we are brought up in this way, we think we cannot have a normal conversation or conversation of any interest if we converse with opposite sex. This is definitely not the case in western countries. As a result we do not understand the opposite sex as much as westerners do.
Sex on the other hand in our culture is seen as a taboo. Not many or hardly any parents talk to their kids about sex. Sex is not discussed is a normal manner. It is vulgarized. Having lived in the US and now in Europe, I can say from my experience that Americans due to their religious beliefs have different view about sex than Europeans who are more open. In the US, sex is vulgarized; in Europe (Scandinavian countries and France) sex is almost natural. So seeing naked women in ads on TV and posters in France do not invoke the same feeling as seeing a clothed women dancing on American rap songs. It is all about how sex and opposite sex (in this case female) are presented and that is what shapes our view about it.