ya I think that is true. I doubt people planning this write it that bluntly. I don't know what men who plan this say and write, probably something vaguely sexual and provocative.

I do see women write "not looking for anything serious" somewhat commonly.

OTOH I think it goes nowhere if you write you want a serious stable relationship, maybe wife and children at some point. I am guessing but I think it scares some women off and it doesn't really build attraction with them. I have seen women write this in their profiles and when you mention you want something similar the conversation fizzles out real quick. I don't think there is any hard rule here though. A lot of factors can affect this.