nah dont be silly, many of the actors/actresses have love lifes outwith movies - and I am damn sure if a director asks them to do it real thery are going to agree with it
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"In the year of our Lord 1314, patriots of Scotland, starving and outnumbered, charged the fields at Bannockburn. They fought like warrior poets. They fought like Scotsmen. And won their freedom."
in monsters ball i doubt they are having real sex, they may both be naked and there genetal parts may be touching but it is highly unlikely that billy bobs cock is in halle's pussy.
I don't know who had seen tteh dreamers, but I'm fairly certain that there is realy sex in that film. It's a pretentious artsy kind of sex, where another character is cooking an egg while the two are doing it, but it seems pretty real to me.