Compass investigates the rules about sex within three different faiths. For Muslims sex within marriage is seen as an act of worship, although in the public arena the emphasis is on de-sexualising the body. For many Jewish women, the Mikvah or ritual immersion in pure water is a monthly pre-requisite before sex. And with many Hindus, although sex is not expressed openly in everyday life, the worshipping of a god represented as a phallic symbol is. We also uncover the facts behind some popular myths. Do Orthodox Jews really have sex through a hole in the sheet? What do modern Hindus think about the Kama Sutra?