There are many things that will affect your ability to have sex, and your enjoyment of the sex. This is always different for different people, so I am going to highlight the usual and often seen fluctuations – but remember that everyone is wonderfully different, so you may find yourself on very different ends of the scale!
Timing
Sometimes the time of day can make a really big difference. Some people are morning people, most people due to lifestyle are used to having sex in the evening. The one thing that I know can screw you over (and not screw in the positive sense) is...