I would say no, for a few different reasons.

1. she will probably ask, and you should probably just say, 'lets think about the future rather than the past'. Be friendly and playful, but evasive. Don't admit or deny anything. Make a jokes about it, but don't give her any info.

2. When a woman asks you about past dating relationships, she is usually not really interested in YOUR past relationships, its just a way to open the conversation so that she can talk endlessly about HER past relationships. They do this. all. the. time. Its so boring and so predictable. They do it as a shit test or comfort test (not sure what is the correct term) but basically they do it to try and make you jealous. Its super boring. So I would say get out in front of that by not taking the bait and NOT telling her about your past.

3 Also, women have a strange relationship with their own sluttiness - they are simultaneously disgusted but it but also proud of it. They think it makes them more interesting and experienced, and they are just dying to tell everyone (esp you) about how amazing all their prior boyfriends were. Most of it is exaggerated and lies, and half of them weren't even 'boyfriends' but just some chad that was stringing her along while pumping other chicks as well. I have literally never met a woman in a LTR that doesn't want to gab on all the time about past lovers. If I could have my time over, I'd be much more strict about this.

I would recommend one friendly warning, and then if (when?) she reoffends and tries to tell you all about how amazing and chadly her other 'boyfriends' were to just shut it down really firmly - just say 'Nobody is interested in your petty flings and childish hook ups - least of all me'. If she re-offends, i would hard next.

Iron rules of Tomassi: never reveal your sexual past to a woman.

Depends on if it works in your favor:

1. Very extensive history with hot girls? She should know, something about a hot ex keeps a girl on her toes and reaffirms your SMV

2. Cant hold a long relationship? I think it says something about you if youre like 30 years old and havent had 1 solid LTR. It says inexperience or other red flags to women that may break the LTR

3. Never had a girlfriend? She will think you deceived her into thinking youre attractive. If she actually stays around it wont be a good LTR unless youre really young.

4. Perennial playboy? 80 n-count no LTRs? She may get wet, she may even think shes the special one out of all of them, but im convinced this does damage to the LTR in the long run. She will be jealous and insecure all the time, and not the good type. More like the kind of insecurity of accusing you of cheating, she may play jealousy games because she is constantly dreaded by your past. Too much dread = Broken LTR.

**That being said.. I personally would feel weird going far enough to marry a girl without her knowing of any past relationships. I think its fair to know a vague idea about both partners history if you are considering marriage. But a new LTR? I wouldnt bring it up at all until she does, you cant really avoid it if shes persistent and serious about wanting to know. Dodging it is a bad look. Shes not asking body count, shes asking general dating past.