Give me some stories I should tell a girl about ex-girlfriends or sex partners if she asks. (I haven't had any)
This will be good for others too.

No one?

I think saying that your ex was a stripper is a good one. Then you can say that the girl was hot, but you had to dump her because you want a classier woman and it's not worth being with a stripper just for the great sex.

Or tell about a girl of another ethnicity that you dated. Discuss the differences/challenges that presented in your relationship. Maybe you had to deal with discrimination and racism, or cultural differences.

The common theme you want to convey is that hot/exotic women desire you and while you are experienced sexually, you are looking for someone more like the person you are now talking to.

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“Nothing is impossible, the word itself says 'I'm possible'!” ~Audrey Hepburn

I typically stay away from talking about ex's...If you open yourself up to talking about Ex's too much, you will talk yourself out of her pants, and talk her right back to him! My2C

I use former GF as a weapon when girls talk about their Ex/BF a lot.

"Yeah, my last girlfriend was a Freak...I am pretty sure noone else will be like that"
"My last GF was a Pharmacist, she was my sugar momma, Maybe we should go on a Cruise to Mexico or something!?"
"My last GF was pretty awesome, too bad she moved too far away!"

This will usually shut them up...

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Crypto...
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All girl's are Freaks...It is your job to bring it out in them! - Crypto

You need to stop bending over and letting her ass fuck your brain! - Heywood

Good point. Sometimes I will catch myself starting to talk about ex's, then I will kind of sigh and say "Ughhh..Don't ge me started on ex's..."

Girls will relate to this and they won't push it further. And it makes you sound like you have a lot of experience with former lovers, without having to give any details.

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“Nothing is impossible, the word itself says 'I'm possible'!” ~Audrey Hepburn

Typical rule is to stay away from conversations of past relationships, but if it does come up NEVER speak badly of them as it reflects poorly on you. If anything you can state how you were blessed with meeting some wonderful women in your life but discovered the two of you weren't compatible as lovers kind of thing.

A lot of guys try to invoke the 'prize' frame by discussing an ex and how she did not meet his set of standards (role reversal), most women can detect the guy is trying hard by doing this so its something I am strongly against doing.

What about something like "I really liked the girl, but the circumstances just weren't right. She was actually really cool, smart, and attractive, but her work took her out of town a lot and we just grew apart..."

It shows that you are not bitter. You were with a desireable woman who liked you. And the relationship is totally over because it simply couldn't have worked, eventhough it was not your fault.

This actually happened to me, lolz.

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“Nothing is impossible, the word itself says 'I'm possible'!” ~Audrey Hepburn