Why do celebrities kiss each other in movies?

do they wash their mouths after kissing? don't they think it is disgusting to kiss a random person who is not their wife/husband? why do they want to entertain public by kissing? dont they have shame? why do they need that kind of publicity? why cant they act in movies like olden days movies without... show more do they wash their mouths after kissing?
don't they think it is disgusting to kiss a random person who is not their wife/husband?
why do they want to entertain public by kissing?
dont they have shame? why do they need that kind of publicity?
why cant they act in movies like olden days movies without kissing or acting in romantic scenes like cuddling, having sex etcc.......?? eeww

what is your opinion on this question?
thank you....
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