Should I tell my girlfriend about my secret?

If the relationship isn't going anywhere and by that I mean, you have no intentions of marrying her then don't tell her. I only say this because you seemed as though you were hinting that she only wants you so that she can have intelligent children. It usually takes 2 to have a baby. The child may receive more of your traits or maybe hers. It depends. It seems a little ignorant and stupid of her to forget that.

However, if you do plan to marry her and she does genuinely love you then you should definitely tell her. You shouldn't lie to a woman you truly love. If she loves you then she won't mind too much and stay with you. If she breaks up with you over this then she is obviously a shallow idiot that only wants intelligent offspring because she's too stupid to know any better.

I'm sorry if this offended you or anything like that. This is just my honest opinion.

Lol, yes that's terrible wrong of you to do, especially if you really like this girl. If you actually like your current girlfriend and see a future with her, tell her dude. You're only going to make things worst and I can guarantee she won't forgive you. But if she's just a toy, don't tell her, why make your life complicated?

well at some point she will start to ask questions so its better to tell her just to get it over with and not go crazy about thinking it so much.I suggest you tell her though good luck!

It's wrong not to tell her how would you feel if she did that to you plus your just being selfish cause you wana have sex

Think about this, when she finds out you're f***ed in the other sense of the word.

You should really tell her. I understand why you'd like the sex and all, but it's unfair to her that she doesn't know.

It's dishonest. And further, you're using her. Tell her straight off.

you need to tell her. ASAP! That's an awful lie. If that were you I'm SURE you would want to know.

yup

Eww you're creepy and old.