Sex is a vital part of romantic relationships for many people, apart from maybe those who are asexual. For everyone else, it is what separates an intimate relationship from any other friendship.
For some people, the lack of sex in a partnership may lead them to be unfaithful. Not necessarily because they want out of the relationship, but because their needs aren’t being met.
According to psychologist Madeleine A. Fugère, sex is so important in a relationship because scientifically it brings people closer together and forms bonds.
She explained in a blog post on Psychology Today that there are four scientific ways sex makes you feel closer to your partner.