How many girls has Dean been with on the show?

I suck at remembering episode titles. "Provenance," maybe? The one where Sam met Sarah the art gallery dealer (who I liked very much and wish they'd bring back somehow) where Dean went home with two girls and reappeared very hungover the next morning.

The one where Sam met Sarah the art gallery dealer (who I liked very much and wish they'd bring back somehow)

You are not the only one. There's a whole campaign. Well, maybe just an online petition.

She was smart and funny and gutsy! Like Jamie from Monster Movie. The four of them could join forces and drive around and fight crime or something.

What was the monster in that one?

In Provenance? The little girl with the straight razor who kept popping out from an old portrait and slashing people to death. The portrait was being sold and re-sold from Sarah's father's art auction house (which is how Sam and Dean met her) and they tried to burn it; it wouldn't burn and it turned out they needed to track down a doll at a creepy mausoleum. (Did that ring enough bells or do you need a better description?)

I remembered another one of Dean's bedpost notches -- the starlet in the horror movie he was crushing on when he was undercover as a PA in California (I don't remember the title... maybe "Hollywood Babylon?" It was after the Madison incident.) Anyway, the episode ended with one of those "if the trailer's rockin' don't come knockin' " shots.

Thanks, Morgana. I remember now.

Ahaha! I remember the PA one. That was hysterical.

Dean going home with two girls--attaboy. I like him better as a player for personal reasons, although the tender side is sweet.

Aha! After some interesting reading, I found Dean Winchester is a feminist. I almost didn't click on the link, because, hey? What? But it had the paragraph I was looking for. And she got everyone you guys got:

All that flirting produces plenty of phone numbers, possibilities and outright offers. But it is not often demonstrated that Dean follows up. Although the impression given (by Dean himself) is that of cheerful promiscuity, the truth appears to be rather different. There are some passing encounters between consenting adults: Lisa "bendiest weekend of my life" Braedon 9 years before 3.02 The Kids Are Alright, rocking the trailer with Tara Benchley in 2.18 Hollywood Babylon, the "doublemint twins" in 3.01 The Magnificent Seven, Jamie in 4.05 Monster Movie. There is one relationship which is rather more serious, at least to Dean: Cassie in 1.13 Route 666. It's too soon to tell about Anna Milton in 4.10 Heaven and Hell (although she burned up the body in question, she has since twice reappeared in the same corporeal form, which in the Supernatural world leaves just about anything open.)

For the record, getting to that synopsis was quite traumatic. I had to (yes, HAD TO) read an article where the journalist had posited that JA's real life predilections might be contributing to Dean being a sex addict (and then he deleted it, but not before the fangirls read it) and the above linked article which posits that Sam is less feminist than Dean, not to mention her definitive stance on pron. And, oh, the links I avoided clicking on...

Surprisingly, none of the wikis I hit thought shagging partners were important enough to include, although one did include Dean's relationships. WhatEV.

posited that JA's real life predilections might be contributing to Dean being a sex addict

I'm assuming you're (or the journalist was) referring to JA's rep for dating dozens of women in his early-to-mid twenties?

From a perspective sort of a cross between anthropological and avuncular (can work for maiden auntie POV, right?), I equate that period with Jared's early-to-mid twenties when he babbled publicly about Sandy and their relationship. He has since, in his mid-to-late twenties, been close-mouthed and circumspect about his private life. As Jensen became intensely private in his later twenties. In an apparently stable relationship that has lasted a couple of years with comparatively little publicity, Jensen seems more relaxed in public now.

It just appears to me as age (and experience with publicity and its consequences)-related behavior. I could be reading in. I've been known to do that.

I can't say what the journalist said exactly, because none of the outraged fans quoted him that I saw. But he drew parallels, apparently between Duchovny's sex addiction and his Californication character and Jensen and Dean. Which is totally rude, no matter how many women JA dated.