I happen to know that there is a huge chunk of the male population that enjoys the company of drunk women. Some of them do it at least two nights a week. And then I got married. :-)
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .