My daughter is dating a jehovah witness
Other things they are prohibited from doing include being patriotic, as it is seen as "worshipping an idol", or voting or canvassing for political parties as they remain politically neutral.
Many followers say there is a a sense of community that can come with being a Jehovah's Witness - as they are tight-knit and have respect for each other.
Serena has been more outspoken about the religion - which was started in the 1870s in the US - constantly thanking "Jehovah God" for her success as a tennis player.
In a recent Vogue interview she also said: "Being a Jehovah’s Witness is important to me, but I’ve never really practiced it and have been wanting to get into it.
As one Jehovah's Witness told the New Yorker: "It’s as much a sin to take a blood transfusion as to have an extramarital affair".
This has led to several deaths - and various court battles between Jehovah's Witnesses and doctors seeking to treat them.
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So it's likely that the first person you choose to date will be the person you marry.