True, I included sex scenes in three of my military-themed novels, but without lingering on the obvious bodily details. I like to think my readers have sufficient imagination to understand what is going on.
However, some new, younger, literary agents seem convinced that no manuscript is acceptable unless it is slathered with numerous sex scenes described in excruciatingly gross detail. Typically, such “agents” are gormless, gauche, and quite unsuited to their job.
I treasure the memory of one such poor soul (female), who suggested that I change a WWII manuscript of mine to include a scene in which the soldier hero copulated with a woman war-correspondent aboard a landing-barge speeding through shot and shell while approaching an enemy shore fortress.
Evidently, the agent lacked my experience that when you are under fire, sex tends to be rather the last thing on your mind.
-- Sidney Allinson.