So, a week or so ago someone posted about scientist having the ability to grow I believe the uniary track in rats.  Then the discussion turned on being able to grow erectile tissue & the possibility of having surgery to have a fully functional penis.

Now, he is my thought to ponder -- I know many hetro ftm's are in relationships or develop relationship with lesbians.  If the surgery is possible then would that change or is there something innate with an attraction to a lesbian.

Tbh I think it's just about how open and flexible someone is. Sexuality is meant to be more fluid you know? I think the goal would be to find someone who likes 'you', I don't think getting a more realistic penis will change how some straight women are just less accepting because I guess you;d have to tell them at some point, i think. And if you couldn't tell them, maybe they aren't the right person? I think that is why a lot of FTMs go out with lesbian women, that community is just more accepting and open minded by proxy.

My partner identified as 100% lesbian, and then when she was with me she really liked the idea of me having a cock. In fact, it actually weirded her out whenever she got down there and realized I had a vagina and stuff. I think if we had stayed together, and I had gotten a penis constructed, she would have been ok with it.

Sometimes it just gets confusing.  Good thing I'm rather asexual and uninterested these days.

If a lesbian is fine with a transman partner who has had one of the present-day genital surgeries, then I don't see why her feelings would change if her partner had a more technologically-advanced genital surgery. I'd like to also say that "if a lesbian is fine with her pre-op transman partner, she'll also be fine with whatever genitalia he acquires in the future because she must love him as a person regardless of gender" but unfortunately that's not always true.
I'm not sure I understand the second part of your question though "is there something innate with an attraction to a lesbian".

Personally I'm not into lesbians, and being a guy I don't see much sense in pursuing them. Honestly, I would be a little offended if a lesbian was attracted to me after finding out I'm a transguy. I understand that sexuality can be fluid and that some people have exceptions to their usual orientation, but I suppose I'm not secure enough to trust that I'm the exception and she loves me for me. It probably doesn't help that I'm pre-T pre-op. I'd be more trusting if I was already well into transition.

I think that with all the burden of social conditioning around gender and body-shape and genitalia, and with the immense complexity of people's sexuality and orientation on top of that, it's a bit harsh to castigate someone for having a different level of attraction towards a partner depending on what genitalia they end up having.

People fall for a particular person in a particular shape, and when that changes, it does change things - and that's either okay in the end, or it isn't. People go off each other for things as apparently trivial as a change of hairstyle, so I think it's naive to say "If you loved me as me, you wouldn't mind what parts I have..." - if you're going to change your body, you have to expect that to rock the boat in a relationship, even if in the end no-one abandons ship. Either way, it's wise to be prepared for turbulence.

Oh, wow, I think that would be amazing if a surgery could give someone a fully functional penis.   If that were possible, I would totally do it.
But since I'm attracted to males, not females, I wouldn't be in a relationship with a lesbian in the first place.

Its weird because im attracted to straight women. Im not saying i cant be attracted to a lesbian, but every girl ive ever liked was straight, and oddly enough, every girl that has ever admitted to liking me considered themselves straight.