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from www.tmz.com – Joan Rivers couldn’t be happier her daughter is dating the god of sex tapes Steve Hirsch — telling TMZ Live, Melissa Rivers and her new XXX man are a perfect fit … in more ways than one.

Joan tells us, not only is Steve crazy about Melissa — “He makes a great living … and he’s Jewish.”

But Melissa — who hooked up with Steve through a friend — isn’t the only one reaping the benefits of her new relationship … Joan adds, “I’m 78 years old and now I get a discount on lubricant.”

TMZ broke the story — Melissa and the Vivid honcho have been dating for a couple weeks now — and sources tell us … “The relationship is going great.”

See the clip – www.tmz.com/2011/12/14/joan-rivers-daughter-dating-steve-hirsch/#.Tukg1WMr27s