DevilsTrigonometry

No. What would be culturally-feasible, though, is an environment where nobody is casually naked in shared spaces. This is already the case in female berthings - I never saw a single one of my shipmates naked after the day-1 boot camp group-shower-as-rite-of-passage.

Re: the sexual assault issue, sex segregation does not prevent sexual assault. I was raped multiple times while I was in the Navy. At no point were the sex-segregated living arrangements even a minor obstacle. They may actually have made me more vulnerable in some ways (isolating me from my classmates and colleagues, making it so I had to go out to bars/hotels if I wanted to socialize in mixed-sex groups, and at least in one case deterring me from resisting because I was afraid to get caught somewhere I wasn't supposed to be.)

The official answer is, as others have said, that voice deepening from testosterone is irreversible.

My personal experience is that if I go off testosterone for several months, my voice changes: I lose a couple of notes at the bottom of my range, and my speaking voice gets thinner/lighter to the point that I occasionally get misgendered over the phone.

(To be clear, it doesn't go back to my original voice; it just goes from a fairly mature cis-passing voice to something more ambiguous. I don't know why, but my guess is that there's some involvement of skeletal muscle in supporting my voice and creating resonance.)

So while absolutely nobody should take testosterone with the expectation that the voice changes will be reversible, I would also caution people against taking it with the expectation that the voice changes will be completely irreversible. The reality may be somewhere in the middle.