Voyage to Eternity by Stephen Marlowe

The trouble with the Stalintrek, Sophia thought, was that it took months to get absolutely nowhere. There had been the painful pressure, the loss of consciousness, the confinement in this tight little world of dormitories and gleaming metal walls, the uncanny feeling of no weight, the ability -- boring after a while, but interesting at first -- to float about in air almost at will.

Then, how many months of sameness? Sophia had lost all track of time through _ennui_. But for the first brief period of adjustment on the part of her fellows to the fact that although she was a woman and shared their man's life she was still to be inviolate, the routine had been anything but exciting. The period of adjustment had had its adventures, its uncertainties, its challenge, and to Sophia it had been stimulating. Why was it, she wondered, that the men who carried their sex with strength and dignity, the hard-muscled men who could have their way with her if they resorted to force were the men who did not violate her privacy, while the weaklings, the softer, smaller men, or the average men whom Sophia considered her physical equals were the ones who gave her trouble?