The question is very general. Sorry for the banality, but you need to figure out what kind of men they are, how old they are, in what environment they live. There are "hussars", it is justly written about them above. There are people of purely peaceful professions, there are people of undefined occupations. Perhaps you like the men of the particular group that is fickle in their feelings. And you should pay attention to a more predictable option.
But at the same time, there are a number of qualities that any man will appreciate in the long run after people become physically close. Kindness, endurance, ease, cheerfulness in communication, disinterestedness.
Because not a single woman, even the best woman in the world, can replace the thrill of battle and the feeling of blood companionship that is born at this moment!
Because it's boring, stuffy, tired, mortal longing ... There is no more champagne in the blood, but only swamp water ...