What is the theme in Starship Troopers by Robert A. Heinlein?

Starship Troopers presents a very particular view on women. In part, it reflects the time in which the novel is written, the late 1950s, before the modern women’s movement gets under way. It shows males treating them with great chivalry and deference. Dating clearly survives into this future age, shown in narrator Rico’s recollections of high school and of weekend passes during training. There is no indication that the sexual revolution of 1960s-70s actually happened.