I can respect your views and see your point, everyone has different boundaries although I will say it would be better to find a partner with similar views.

Physically or emotionally cheating with someone creates a bond between both parties, they're actively engaging with each other. Watching people on cam is also engaging and I would most certainly consider that a betrayal. Someone getting aroused by watching a suggestive scene in a movie or show forms no connection, I personally wouldn't call that cheating.

Society doesn't always know what's best but the majority of people have decided such behaviour is acceptable. You can disagree with it and that's fine but trying to dictate what others can do is controlling and not okay.

Your English is excellent btw.