Actually if a person started out as a regular guy and then got chemically castrated during the transformation process into a space marine he would still retain a deep voice.

Now I'm picturing all space marines with comically undersized sterile genitals who live in forced celibacy together in cramped quarters with a lot of grumpy sweaty battle brothers who never get in contact with women. How sad their existance must be and no wonder so many turned to chaos

God said:

Hahaha, seems we have a psycho analysis expert here. How about your mirror image sis?

I suppose, getting back on topic just a little, the question now must be, would they be realistic or stylized useless cocks? (Tiny or otherwise).

This thread man, this thread....

I'm outta this thread, you're hurting my religious feelings.

Worse, most marines are recruited before puberty, they'd all be high-pitched voices. Better to sing hymns to the Emperor I guess.....

... Well, now I understand why they keep space marines genemodification a secret. Who would like to tecnically lose their dicks

Everything comes at a cost

All we need is Nurgle, i can just get another penis if i really wanted to.

Exactly, who needs a penis when you have tentacles growing out of your crotch: