Does penis size matter in terms of a man’s attractiveness and the pleasure he gives his partner? The penis size in humans is the largest in size compared to all primates. Through the evolutionary process, female species have developed an interest and preference for the shape and size of the male genital organ. As a result, the preference for the larger size is reached. The process is known as selection by sex. The larger size is also an advantage for the male, as it is more efficient at ejecting sperm into the female’s reproductive tract during intercourse. A study shows that women of the fairer sex are more likely to experience vaginal orgasm with men with longer penises, as this stimulates the entire length of the vagina and cervix. Women experience two types of orgasm. Vaginal and clitoral orgasm can be completely different phenomena. They use different nerves and even stimulate different areas in the brain. Many studies have found that women don’t care about penis size as much as men think.