Actually they sterilize you and remove your sexual drive though I think you still maintain a penis but it flopping around in the armor suit would probably be an irritance so why not just chop it off and use another means for testosterone.Cheshire the Cat said:Fuck no. Being a space marine would suck ass.
They recruit children, as in pre puberty. The testing alone will probably kill ya, if not then the surgeries probably will.
And even if you do survive to be a space marine, its still pretty shit.
Your personality is pretty much wiped by psycho indoctrination, your emotions are dulled, your entire life becomes nothing more than fight and train, oh and you do not even get to fuck anything since you no longer even have a penis.
Ask any body builder. As they gain muscle their penises start to shrink since the body basically builds up around it. Same with over weight guys. The dick stays the same length but the body swallows it. Exact same thing with Marines. So basically all you are left with is a tiny little mushroom head to piss out of...
They do maintain a personality though.