Why do men have breasts and nipples? It's because men start out as women. The human fetus is initially female. At six weeks' gestation, the outlines of eyes, arms, legs and a face appear and at about that time the fetus begins to take on the biological aspects of its gender. If the fetus has a Y chromosome, testosterone will turn the buds for sexual organs into testes which produce more testosterone and a penis appears. So, breasts and nipples are already in place before testosterone shows up and cells form into male organs.
In humans, this lasts for around 6 weeks, after which genetically-male fetuses begin producing male hormones such as testosterone. Usually, males' nipples do not change much past this point; however, some males develop a condition known as gynecomastia, in which the fatty tissue around and under the nipple develops into something similar to a female breast. This may happen whenever the testosterone level drops. Gynecomastia, although not as severe, may occur in pubescent boys undergoing physical changes due to the rapid and uncontrolled release of hormones, including estrogen. The heightened levels of estrogen in pubescent male bodies leads to the swelling of the nipple and surrounding tissue – this can often look similar to a female human nipple – and may cause slight discomfort. Gynecomastia is a hormonal imbalance that usually occurs in teenage boys and treatment is not usually necessary. Things are likely to return to normal around the age of 18 or 19.
Most men are distressed if their breasts begin to enlarge. I would have thought all men would be, but judging by the picture, apparently not. Fortunately, the problem can be gotten rid of fairly easily. Most men begin to develop excess fat deposits when they reach their late twenties and their metabolism slows down, especially if the have a sedentary life style. Fat gathers in different places for different people. Women are most likely to see fat in their buttocks and thighs. Men tend to see fat in their stomachs and mid-sections. Man boobs are just the result of bad luck.
Man boobs (moobs) as shown in the picture come from being overweight. They're composed of fatty tissue stored over the pectoral muscles. The only way to get rid of them is to lower your weight overall because you can't pick and choose the location from which your body is going to decide to dump its excess weight. You need to engage in a cardio and strength-training workout program and follow a proper diet. Or, you can get one of these...