The more the better, if you ask me. "Ladylike" is stupid. Women can be however they wish. As for what most guys like, I don't think most guys would care much. Maybe if it was as much in the video, or religious guys or something.
If she used them non stop, yes it would turn me off But my kids probably learned every swear word there is from my ex wife lol. if she got scared or something happened she would go off. But it was only in certain circumstances. I rarely swear around family. But in certain job situations I used to a lot.
I swear and sometimes I can swear a lot, especially if am angry but generally I try and tone it down a few bars when in public places, at work and visiting family members. I am not against a woman swearing but I am not pleased with people who drop a C-bomb or an F-bomb in every single sentence, it's excessive and isn't necessary.