I told my wife about Jenner’s comment that life as a woman being primarily a matter of mental state and lifestyle. With due scorn and, I believe, justice, she scoffed at this.
When he gets cramps and bleeds five days a month for decades, then he can talk about being a woman. Something to that effect. More basically it is the capacity for pregnancy and everything that entails that makes a woman a woman.
Or, as with so many other topics, South Park said it best in the following dialogue. This is where Mr. Garrison gets a sex change and thinks he is pregnant and so happily goes to the abortion clinic. Note: the scene is pretty damned offensive (and funny) and so to the point.
MRS. GARRISON Hello doctor, looks like I need an abortion. DOCTOR ...an abortion? MRS. GARRISON Yeah, I've got one growing inside me. Now, are you gonna scramble its brains or just vacuum it out? ...If you want you can just scramble it and I'll queef it out myself. DOCTOR Mmister Garrison- MRS. GARRISON Mrs. Garrison. DOCTOR Mmrs. Garrison, you can't have an abortion. MRS. GARRISON Don't you tell me what I can and can't do with my body! A woman has a right to choose! DOCTOR No, I mean you're physically unable to have an abortion, because you can't get pergnant. MRS. GARRISON But I missed my period. DOCTOR You can't have periods either. You had a sex change, Mr. Garrison, but you don't have ovaries or a womb. You don't produce eggs. MRS. GARRISON You mean, I'll never know what it feels like to have a baby growing inside me and then scramble its brains and vacuum it out? DOCTOR N-that's right. MRS. GARRISON But I paid five thousand dollars to be a woman. This would mean I I'm not really a woman. Ih, I'm just a... a I'm just a guy with a mutilated penis! DOCTOR Basically, yes. MRS. GARRISON ...Oh boy, do I feel like a jackass.