Bahrainis enjoy entertaining friends and family in their homes, although they will also socialize in restaurants, clubs, and international hotels. Entertainment is often same-sex only. Friends may be invited to a Bahraini’s home. In Bahrain, it is considered polite to leave some food on your plate when you have finished eating. This demonstrates that your host has showered his guests with generosity and abundance.
Source: http://www.bahrain.bh/wps/portal/!ut/p/a0/hc6xDoIwEIDhV-nCfAdEgiMxBsNCojFiF3JiwdPaQmmJvr3RF3D8k2_4QUID0tDCA3m2hvS3ZdbuasziJE-qPD2mWNTZZr_eYlziCg7KQPUPNXDm-zTJAmRnjVcvD40a7DJa50m35CJceGYvLnRzxCbCMKs-aMGmt-75m4mwC9oHpwSZq5htx8q_YXyUpw9-rh8c/, http://www.factsking.com/countries/bahrain/