Are you serious???
What did the existing employee do to deserve such treatment?
Dudes on this thread are being histrionic, like, if I can't call a woman a MILF at work, what's next, the PC gestapo are going to prevent me from making eye contact with women.
I can't stress this enough: if not being able to call a woman a MILF in your day to day life is an imposition, you really need to reevaluate how you talk to (and think about) women. I'll skip the moral appeal and go straight to self interest: on average, women just don't like that shit. You catch more flies with honey than you do unwelcome, overly sexually aggressive comments.
2Yes, sexual harassment involves many things which fall far short of sexual assault. And, sure, maybe those are first world problems -- if you want to run a successful business in the first world, then you shouldn't be surprised by the need to address first world problems.
And, sure, maybe some women like playing hard to get. The existence of those women does not create license to continue to pursue any woman who has turned you in the workplace. Nor does it remove the legal obligation of the employer to address such unwanted pursuit. What you do when pursuing women who are not your coworkers outside of your work environment, so long as it comports with the less restrictive laws applicable in such environments, is your own business.
Also just because there are worse things than verbal sexual harassment doesn't mean it should be ignored.
It's a work environment, not a bar. No one should normally need to make a "first move" in this context. Sure, work romances do sometimes happen, but I don't think our population is in any danger if they do not.
A quick google suggests that 38% of people have dated a co-worker.
Edit: Actually we've banned this account for trolling.
There you have it. I'd bet dollar to doughnuts that if this person had simply "expressed interest," I don't think there would have been an issue. But if a total stranger says they only want to "hang out" as friends, and your reaction is to call them a MILF and try to share some creepy "secret" with them, that's clearly an unwanted interaction.
If you can't see why, I think quite a few people are very happy you don't have plans for management.
It's not your job to handle shit like that. If the person continues and it makes the work environment hostile than it might be, but not a one-time interaction like OP describes