A distinguishing feature of mammals, this is a question that has provoked centuries of theories and explanations.
this stage the male Y chromosome is triggered and determines the male characteristics by releasing testosterone which prevents the formation of further breast tissues.
Men can however, still develop breast cancer and any unusual lumps should be immediately reported to the G.P. During times of hormonal change, particularly during the teenage years, boys can develop enlarged breasts, a condition called gynecomastia which your family doctor should be made aware of and appropriate treatment (in extreme cases, surgery) will be sought.
It has no particular function, but many men derive sensual and sexual feelings from nipple stimulation. It also has the aesthetic effect of drawing the eye to the pectoral muscle when on display.
