/r/Relationships is a community built around helping people and the goal of providing a platform for interpersonal relationship advice between redditors. We seek posts from users who have specific and personal relationship quandaries that other redditors can help them try to solve.
r/sex is for civil discussions about all facets of sexuality and sexual relationships. It is a sex-positive community and a safe space for people of all genders and orientations. This is (mostly) a 'serious' community - posts and comments that sidetrack discussion will be removed and may result in a ban.