Speaking of WW2 POWs. There is an excellent book called GHOST SOLDIERS about the survivors of the Bataan Death march .
The POW’s main conversations were indeed food, more food and still more food. (One POW still told a story of how a Polish-American described his mother’s home cooking so well and in loving detail. The POWs would have this soldier talk about the same meal over and over again).
The only time sex/woman frequently came up was towards the end of war when the prison guards high tailed it. The POWs found a huge cache of food left behind by the guards.
Between this new found food and the distinct possibiity that the war was ending, only then did the men start talking about women again.
To make it hiker related: Sex was the least of my concerns on the long trails!
When you are tired and hungry, sex is the bottom of important things.
Of course not that some men don’t do “pink blazing” to catch up to woman. Not sure why…I suspsect stalking a woman by hiking 30 mile days would NOT be something most women admire. 
Mags