benignuman – That deals with activity. I strongly hesitate saying that playing a game is Margil L’Ervah by definition. The Tur/Shach is almost using the Mishna quoted to define ??????? ????????? ?????. I can do the same exact action with different people, and with some it would be ??????? ????????? ?????, others not. That shows it depends on “intent”. Using your example, I can play arcades with Ittisa, my daughter, my sister, my neighbor’s wife, a co-worker (male or female), or my son. Some are ???????????? ?????????, others not. You can’t say that it is (by definition) for a Niddah, but is not for a real Ervah (such as a sister-in-law).
I brought the Shach to define the Dibbur. Once you agree that “laughing” is not “Schok”, you need to have a definition of what type of Dibbur is Assur, that which is “Margil”.
LUL – Your point touches on a large Machlokes Rishonim with many Nafkei Mina in the Halachos of Tznius, Ervah, and Histaklus. We can start a new thread if you would like.