They think mind reading, trial and error, or even ignorance is preferable. Granted, some men can't stand to admit that there's anything they don't know about sex. But most men will tell you they're eager to know more about their partner's body and sexuality. These guys are dying to know what makes a woman experience desire, arousal and satisfaction. Words are great, of course.
Some people prefer to talk in bed.
Honey, I'd love this. Nonverbal communication works well too, as long as both partners understand it. So put your hand on his and move it the way you want it, or gently take his hand away from a place you don't like it and put it somewhere you do. Or sigh when he licks you just right. But if you find these gestures don't work, talking is probably required.