Kissing While Acting
I think kissing while acting is definitely sad e zaria. It is the first step to normalcy or desensitization. Mostly those who do immoral or illegal acts do not do it the first day. They start one step at a time until each steps feel normal and harmless and onward to a point where even extreme feel mormal. That is why Islam stops us from taking the first step. Perhaps the first step may not earn a person a sins, but slowly it would lead a person to big trouble. Think about just a few quick kiss scenes, then after few of those it would feel harmless. Then longer more passionate kiss and then onward. The best way is to set your red line right from the beginning. Even write it down and never cross that line.