SAHARA star Matthew Mcconaughey turned down sex with two sisters because he didn't want to create bad karma. The 37-year-old star decided he didn't want have casual group sex with the siblings because he was afraid it would come back to haunt him. He tells Loaded magazine, "Two sisters once offered themselves to me. "But they weren't single and one wanted to get away from her husband. "I don't jive with that. You don't sleep with someone's lady if they're married because it will return and bite you in the a**."