Americans have sex 85 times a year on average. That turns out to be 18 times less than the global average. Worse still, only 48 percent of Americans say they are fully sexually satisfied, according to a survey. The survey found about 31 percent of American adults experienced difficulties in having an erection and one-third have problems sustaining one. The Survey also found Greeks have the most active sex lives while Japanese are the least active. It found 42 percent of Australians, Chinese, Swiss and Brits were happy with their sex lives. In contrast, Nigerians, Indians and Mexicans have a sexual satisfaction rating above 60 percent. "We need to invest in taking time out with our partners, de-stressing ourselves and lifestyles and introducing some romance into our relationships," a sexuality educator was quoted as saying. The survey was the first part of the Sexual Wellbeing Global Survey, by condom maker Durex. More than 26,000 people across 26 countries have questioned in survey.