@Yeetre
Probably because Thorax appears to primarily identify as male, seeing as his chosen common form is male.

Where is gay

Yes

Thorax just casually turns into Spike’s 3 Main Ships.

To be continued (JoJo sound)

@gyashaa  
Maybe in your town. Which is to imply all towns except mine, yes. XD

@Meanlucario  
Sorry to say meanlucario, but college has been taken over by SJWs and has been changed from a place of learning to a place of indoctrination. Gender has always meant your biological sex but ALL OF A SUDDEN SJWs want to force people to use the word differently. I don’t see why they couldn’t make something up like “mental gender” or “inner gender” but “NO, GENDER IS NAO CHANGED TO OUR DEFINITION. >:( “ Anyways, it’s all bullshit anyways. First world problems.

spike: MUST HAAAAAAAAVE!!  
Thority: no wait spike!!!

@Meanlucario  
drag queens have male gender identities, it’s transvestites you’re thinking of

Spike gonna smash

@Prometheushunter2  
My friend said that’d explain the green flames. I’m like, “holy crap that makes so much sense”.

@Smudge_Proof  
You mean if they could get pregnant or if they change back while pregnant?  
Since they’d be female of whatever species they seek to become they’d be able to get pregnant, if they are normally a female then they might be able to sustain the baby after changing back depending on whether female changelings have wombs. If they they are normally a male and change back then I imagine they’d suffer massive internal trauma and the death of the baby

@Prometheushunter2  
What happens to pregnancies tho.

@Cirrus Light
 
Maybe changeling shapeshifting is like transporters from Star Trek. Except instead of “teleporting” the target by disassembling them into energy and reassembling them in a different location, in dissembles then and reassembles them in a new form, changing them physically, genetically, and biologically, making them an exact clone of whoever they are imitating. If that’s true then that seems like an incredibly useful feature

@ArtColter  
DNA can’t make changeling stuff happen any more than blueprints you give a team of construction workers can make them instantly able to dissassemble a city into an entirely different city :p
 
Except it’s even less capable because it can’t make things move on their own (it can make them capable of moving but not actually move to a particular place), but the construction workers can.
 
Also construction workers can plan things intelligently. If you just change a city’s “dna”, though, each building will slowly break down but repair itself to different blueprints, making them dysfunctional and fall apart.
 
So changing DNA or DNA expression radically to another creature’s would certainly kill it.
 

 
…dang, I’m being annoyingly contrary in this thread :P
 
It’s just… DNA, people. Epic misunderstanding of cellular stuff is like a common trope in fiction, and it really kills it for me. And miseducates people.
 
Poor DNA. It just wants to be understood :q  
_{(And passed on. Mostly just passed on and copied.)
 
If you think about it living creatures are just vessels whose soul purpose is to multiply and pass on DNA. Slaves to DNA, which demands immortality and all the universe.  
At least from a “why does it exist” perspective in a materialistic-nihilistic worldview >.>}

@Background Pony #E0E6  
DNA is the genetic material the tells your cells how to function, essentially. So Changeling DNA is able to manipulate cells to do basically whatever they want to do. So, for instance, it could turn sperm cells into egg cells.

@Nightweaver20xx  
So where does DNA fit into all this?

@Meanlucario
 
@Cirrus Light  
Changeling magic apparently rearranges the molecules comprising the being’s body to an entirely new form. So yeah, all of his “parts” would dematerialize at the atomic level and rematerialize into whatever form is needed.

@Meanlucario  
Same place his carapace, antannae and wings went when he transformed into Rarity.
 
Changeling magic. He changed into Rarity.

@Cirrus Light  
I guess that would work, but where would his dick go while in a female form?

@Meanlucario  
Lol, edit ninja’d.
 
I just wish people would practice what they preach and give others the benefit of the doubt.
 

 
As for the Changeling thing, why not just have him be infertile when in female mode? Easy solution.

@Cirrus Light  
Something tells me you may be highly opinionated yourself…

@Meanlucario  
Oh, thank goodness real educational classes aren’t too far gone.
 
Okay, to be fair, that class could be perfectly great and good and all. I just don’t trust that it actually would be, as opposed to divisive and heavy-handed with certain sociopolitical opinions.
 
Which is a real shame. I would hope enough violent riots would show people that maybe instead of trying to blame others for all the problems in the world, a little real tolerance would be great. But apparently they’d rather “tolerate” and “peacefully coexist” with gas grenades (referencing a recent event where a conservative speaker had a gas grenade thrown at him and was then arrested).
 
 
But that’s getting a bit far off topic…
 
Back to the point, you mean the Changeling would transform in every way except the reproductive bits?

@Cirrus Light  
This was a class about diversity in America.

@Meanlucario  
This is why I still think English classes are garbage.