You would call her whatever she identifies as (sexual orientation)... or a woman (gender identity). If you are saying that it is a woman dating an MTF then the woman would be lesbian, or at least until she tells you otherwise.
No current relationship completely defines a person's sexual orientation. For example, a bisexual woman might be dating a man at the present time. That doesn't mean that she is heterosexual, because she still identifies as bisexual and is still attracted to women as well as men. Likewise, a woman who is dating a transwoman might be lesbian, or bi, or pansexual, or asexual, etc. Or she might actually be heterosexual and started dating her partner before they started transition. She might simply be biding time waiting for her partner to live as a man again. However, that is unlikely and an exercise in frustration.
Please don't use the word "shemale," it is offensive and dehumanizing, reducing a person to a fetish and sex object. Instead, use "transwoman" or "MtF (male-to-female) transgender." Use MtF transsexual if she is intending on genital surgery, and simply "woman" if she has had the surgery.
The more socially acceptable term is trans woman or MtF. Or just a woman
"lesbian" is a woman who is sexually attracted to other women."Shemale" is a derogatory term for a transgender MTF woman of any sexual orientation.
Shemale..
A shemale (the proper name is Hermaphrodite) should marry a girl. A shemale is actually a Man that has been semi-transformed into a woman. This means he has had breast implants and has not removed his testicles. So this concludes that shemales should marry girls unless the shemale was originally a girl and has a functional penis and vagina.
A shemale is an offensive term for a man who dresses as a woman for the purposes of making pornography. Many people misuse the term to mean a male-born person who dresses or lives as a woman.
A "shemale" is a derogatory term for a transgender woman with surgically or hormonally enhanced breasts but without genital surgery, who works in the sex industry.
Listed as a "shemale", Bismark is a transvestite male.
If she grows a penis, yes.
Don't call them shemales that's offensive.
No, Futanari is Japanese and means hermaphrodite, they are females with a dick. While a shemale is a derogative term for a trans woman (male-to-female). Trans woman in Japan are called newhalf (nyūhāfu).
A shemale is just a guy who's taken female hormones, so he has breasts and the voice of a woman, but still has his penis, and keeps it that way. A shemale never plans on a sex change operation to rid of their penis
Cougar