>that men act in a subservient way if their access to sex is restricted. If so, there is a strong incentive for the leaders of a militaristic society to repress healthy sexual expression.

I think that you are on to something there, but in my experience it seems that it is peer groups which control sexual expression. For instance, in the US Nixon was re-elected by a landslide in 1968 and the Vietnam War went on for years while at the same time sexual liberation continued to expand until the arrival of AIDS.