You might hold some of your cultural or personal traditions dear to you, but run yourself a thought experiment and consider under what kinds of conditions it could become harmful.

Every tradition has pros and cons - but isn't that true with modern tradition in favor of which we are debating ? In my country the law strongly protects women, and men can barely do anything. Many women take advantage of that and drain everything from men, even some men have committed suicide just because of that.

So I would say sex does not matter, if both have respect for each other and are given equal privacy, privilege by both of their families ( if living in joint).