B-A-S-I-C-A-M-E-N-T-E.

Casual relationship is a physical and emotional relationship between two people who may have a sexual relationship or a near-sexual relationship without necessarily demanding or expecting a more formal romantic relationship as a goal. A casual relationship differs from casual sex, which has little or no emotional element, and different from a one-night stand, as the relationship extends beyond a single sexual encounter. Related terms are friends with benefits and fuck buddies or bed buddies. There are significant gender and cultural differences in acceptance of and breadth of casual relationships,well as in regrets about action/inaction in those relationships.
A casual relationship may be part time, or for a limited time, and may or may not be monogamous. The term encompasses friendships between people who enjoy each other's physical intimacy but do not aspire to be long-term, and may or may not involve parties who desire temporary relationships purely for hedonistic purposes. In each case, the relationship's dominance in the lives of those involved is being voluntarily limited, and there is usually a sense that the relationship is intended to endure only so long as both parties wish it to.
To the extent such relationship include casual sexual contact, the relationship is generally focused on fulfilling sexual rather than romantic or emotional needs.
Motives for casual relationships vary, and should be distinguished from casual sex, which is a specific type of casual relationship. Casual relationships sometimes include mutual support, affection and enjoyment, which underpin other forms of loving relationship.