Sex creates babies. You get better quality partners by being good at sex than by being good at religion. Having sex doesn't make you feel guilty. You don't have to get out of bed to have sex.
Sex is fun.
If someone is yelling at you during sex, you're probably doing it right. The company is better. You don't have unwanted observers judging your sincerity. It is so interesting that you don't fall asleep until afterwards, or not at all. The food part is more nutritious.