We are not living in the 1970s. You are not a burly leading man on a soap opera. Thus, if you have a mustache crawling across your lip, women probably find you creepy.
Here's a complete list of the only people who are allowed to have a mustache:
That's it! So if you are not one of those five men and you have a mustache, it's time to invest in a good razor and shave that nasty thing off. That is, unless you like being thought of as a creeper. Then I suppose you can just keep on keeping on.