As you look at the evolution of film through the 50's and 60's, one trend readily observed is that of increasing use of sex and nudity - as earlier boundaries began to expand. This film, coming in 1965, appears on the cusp of a change from more veiled hints of sex to more explicit scenes as the 60's closed and we moved into the 70's and beyond.
A few themes run through this film, one being that of the overbearing boss many of us have been saddled with in our careers - one who knows that the men have signed on for an extended stay under his "command" and plays his hand to the hilt. A boss who has little or no regard for his men and motivates through intimidation.
Clearly, the director reaches out to the farthest boundaries of the times (and mores) to inject the sexual tension of Ms. Baker arriving on the scene. She is beautiful and sexual and is never out of control of the situation. There is nothing explicit here (but oh so close); nevertheless, the suggestive nature of visits from members of the crew works just as well. In the end, she stands up to the crew commander in a way none of the men (save one) ever had.
I think the film is a well-acted little gem.