When people get stressed it greatly affects their sexuality. This is true for both men and women. There is an evolutionary cause at work here. When you are anxious about danger (in the caveman days, that would be a lion or bear coming by your cave), the last thing you want to risk is getting caught with your pants down, literally. It’s tough to run away or fight when you are locked in an amorous embrace. Hence, when we’re stressed or anxious, we tend to shut down sexually.