Your husband's sexual desire is impacted by what's around him but is determined by biological factors, specifically the presence of testosterone in his body. On its face, prostitution is a cold business—the epitome of mostly male selfish pleasure seeking. Sex as we know it can be traced back at least as far as a primitive fish Sex is a widespread and very powerful evolutionary force, but when did the evolution of sex actually happen and what kinds of creatures were the first to start doing it? I can't really explain it. Just as there is no universal reason for eating hot dogs whether trying to win a contest or scarfing them in front of the television out of habit , there is no single reason across time, culture, and history that people engage in sex. A study published in found that it is vital for males to compete for reproduction and females to choose between those competing males. To boost self-esteem, keep a partner from seeking sex elsewhere, or feeling a sense of duty or pressure for example, a partner insists on having sex Continued The Difference Between the Sexes Generally speaking, men seek sex because they like how it feels. Spend a month journaling about the motives behind your sexual proclivities, and carefully observe and talk to your partners about their own. A man's sexuality has a tremendous impact on his emotional, marital, and spiritual well-being. They rely on water currents to transport their reproductive cells, which is likely how they have been doing it for the last 1. Just as your body tells you when you're hungry, thirsty, or tired, your husband's body tells him when he needs a sexual release. The findings help explain why sex persists as a dominant mechanism for producing offspring. Cultures differ markedly in what are considered to be 'appropriate' reasons for having or avoiding sex. The psychology for me goes something like this: Chris Adami of Michigan State University looks at the process theoretically. If you would like to find out when and why your sexual desire changes, please click here to participate in our study. Stress reduction is one of the leading reasons Americans, particularly men, say they have sex, Richard Caroll says.