Nail, then bail!
Actually, your OP sounds very much like a situation I was involved with years ago. After the first few “visits”, the lady in question confided in me that she was spawn of alien parents and was accompanyed (or however you spell it) by a floating orb of energy, that only she could see naturally.
The sex wasn’t that good.
Personally, I’d be too scared. I’d also be afraid that I’d be responsible making more of them. I think you should be banned from the Straight Dope if you do it. We’re about Fighting Ignorance, and you’re sleeping with it? Not cool.
There’s just one very, very important question you have to ask yourself, Larry.
Is she hot?
Well, that’s one less thing I have to worry about, at least.
Jeez, this weekend we moved on from ancient astronauts to world-dominating freemasons.
Ah well, how to go about creating some distance without hurting any feelings?
You can’t really say “Nice knowing you, but you’re batshit crazy.”
Well, you could, but it probably wouldn’t go over all that well.
You have to admit, though, that would certainly create some distance.
You could always tell her that it has to end because “they” have clearly gotten to her, and you fear for your safety. :eek:
Meh, tell her her feet smell like cabbage, and cabbage reminds you of your long lost aunt mae who buggered you senseless with rutabegas on the family farm in sussex every summer from ages 8 to 13, and that the memory’s just too painful for you to continue on in this “relationship”.
If that doesn’t do it, just tell me where to send the wedding gift.
Well, both. Make sure you’re just thinking of sleeping with her, not building a relationship and marrying her and buying the house with the white picket fence and all.
Then, go right ahead. Does she know your real name? Does she know where you live? Do you have an unlisted phone number? All very important things to consider. :dubious: (that smiley is somehow supposed to indicate that I’m being sarcastic).
I’ve been told that my tinfoil hat is the sexiest thing about me.
Suck it up dude, you might learn a thing or two.
Just don’t marry one.
It’s Hell to serve papers on someone in a bunker.
Tell her you’re with the CIA black ops division and have been monitoring her activities for your alien/Trilateral Commission overlords.
Works every time. 
I was gonna ask. Because if your girlfriend is asking you to eat her cloaca, you’ve got issues.
Mmmmm… cloaca issue.
What made you think she wasn’t crazy - as in pathology crazy - in the first place? These sorts of beliefs can just be “eccentric”, but even if her beliefs are just weird beliefs about the world rather than “The Freemasons control the world and they’re constantly trying to kill me!” they can still be the sign of some underlying condition. There are various delusional disorders that manifest in subtle ways, according to things I’ve read.
The fact that the woman’s behavior doesn’t seem too weird as yet doesn’t mean that it won’t get weirder later.
But if she’s really hot, I’d go for it. I mean, if Goran Visnjic told me that he controlled a secret cabal that was the shadow power behind all earthly governments, I’d still hop into bed with him in a second.
I dated a woman who told me, among other things, that she could use Reiki to contact her dead ancestors. And that there was a ghost of a murdered man living in her bedroom. She at one point complained to me “you look at me like I’ve sprouted moose antlers.” I really wanted to say “Stop talking like a crazy person and I’ll stop looking at you like you’re one.”
Scariest moment: When she wanted to have unprotected sex and if she got pregnant tell her ex boyfriend that the baby was his and make him marry her. She was upset when I told her this was a bad idea.
Part of the reason it was a bad idea was because she hadn’t slept with him in many months, so it’s not like he’d fall for it. Although, now that I think about it, maybe it was more plausible than I thought…perhaps I was the one out of touch with reality.
Anyway she was hot enough that it was commonplace to see other men checking her out, and in addition to looking good she was amazing in bed.
So, I say, go for it, have all the fun that’s possible, and then flee to another state.
Sounds to me like you did the nasty as well.
So how was it? (National) Enquiring minds want to know.
Well, yeah- because, what if it was true!
Perfect!