You know now that I think about it, they never really address this much did they. It was a long voyage the captain had needs? Didn't she bang Paris after they went warp nine?
To be accurate, after travelling at warp ten caused her and Tom Paris to mutate into salamanders (the next stage of human evolution) they had sex and she gave birth to futuristic salamander offspring.
You know, I don't care what anyone says, I love that episode!