Turn off all electronic devices when you have sex. Or, for heaven’s sake, at least put them on airplane mode...
Sex should not be a competition.
The hypothalamus is one of the most important parts of the brain, involved in many kinds of motivation, among other functions. The hypothalamus controls the "Four F's": Fighting, fleeing, feeding and... mating.
Laughing together is an underestimated aphrodisiac. The eye-contact, the sense of connection, the warmth and physical relaxation of a shared funny moment can lead to later moments of heat.