Normative Male Alexithymia, a mouthful of a phrase coined by Dr. Ron Levant, suggests that the typical emotional socialization experience of boys results in suppression of emotions in early childhood.
Dr. Levant developed a psychoeducational approach in working with this quite common issue that I often use in working with male clients.
The goal is to develop skills in emotional identification and expression, and I find that many men find it very approachable.