Actor Christian Slater (search) has found himself on the losing end of business deals after being arrested for allegedly grabbing a woman's behind, a close friend told The Post Thursday.

"There's been fallout for his career," said real-estate exec Gary Munch (search), who hosted Slater at his Upper East Side home until Tuesday's bust.

"A couple of side things [projects] disappeared. There's just people who don't want that sort of thing associated with their products," added Munch, who couldn't elaborate.

Slater left Munch's digs on East 94th Street in Manhattan to avoid contact with the press, but the two, who have known one another for 24 years, are keeping in touch.

Munch said Slater is maintaining his innocence, saying he never grabbed a woman's backside outside a Third Avenue and East 93rd Street bodega while allegedly in a drunken rage.

Slater, starring in "The Glass Menagerie (search)" on Broadway, is exhausted from the incident and has been sleeping a lot since his arrest, Munch said. The facts are "not close to anything that's been reported so far ... except that he's been arrested," Munch said.

Slater's arrest has had no effect on "Glass Menagerie" ticket sales.

"It's been pretty much the same as it's been before," said a show source. It's "not selling out, but they're paying their rent every week and the audiences have been very enthusiastic."